We explored the effectiveness of magnesium oxide (MgO) as a treatment for chronic constipation using a robust randomized, placebo-controlled trial. Over 28 days, participants received MgO, senna, or a placebo.
Both MgO and senna significantly improved bowel movement frequency and quality of life compared to placebo. About 68.3% of those using MgO reported symptom improvement, showcasing its potential as an effective osmotic agent alongside a stimulant laxative.
Importantly, there were no severe treatment-related side effects reported during the trial.
Read More
4
Effectiveness of magnesium on constipation
Effect of reduced daily magnesium oxide doses on laxative effect: a single-center retrospective study.
We explored how changing the frequency of magnesium oxide (MgO) doses influences its effectiveness in relieving constipation. In this study, we looked at 11 patients who had been regularly using MgO to manage their bowel movements and decided to reduce their daily dose frequency over two weeks.
Initially, patients were taking magnesium three times a day, but we reduced this to either two or one dose per day while keeping the total amount the same. We found that the average number of bowel movements dropped from 7.6 to 6.6 in this period. However, this change wasn't statistically significant, indicating that it may not be clinically meaningful.
Additionally, we measured stool consistency using the Bristol Stool Form Scale and noted no significant difference before and after the dosage adjustment. Our findings suggest that reducing the number of doses does not impact the laxative effect of magnesium oxide. This implies that patients can comfortably manage their magnesium intake without sacrificing effectiveness.
Read More
9
Magnesium effectively aids constipation
The effect of food, vitamin, or mineral supplements on chronic constipation in adults: A systematic review and meta-analysis of randomized controlled trials.
We investigated how magnesium supplements affect chronic constipation through a systematic review of randomized controlled trials. The analysis included eight studies with a total of 787 participants. We focused on magnesium oxide among other treatment options and assessed its effectiveness in increasing stool frequency and improving consistency.
The findings were quite promising for magnesium oxide. Our results showed that participants who took magnesium experienced a boost in bowel movements, with an average increase of about 3.7 additional movements per week. This improvement in stool consistency was also noteworthy, scoring higher on the Bristol stool chart.
While other supplements like senna and kiwifruit were explored, they didn't significantly enhance symptoms of constipation in this analysis. Therefore, we suggest that magnesium oxide stands out in this study as a worthwhile option for managing chronic constipation. But it’s essential to remember that further research could help confirm these findings and explore the effects of whole food alternatives.
Read More
Most Useful Reviews
10
Solves constipation
I utilized this under a doctor's guidance alongside a dietary programme to prevent waste from building up in the colon and intestines. I noticed its effects immediately after use; it resolved my constipation issue. A very useful and effective product.
Read More
9
Effective treatment
It is good and effective for treating constipation.
Read More
9
Relieves constipation
It successfully relieved constipation effectively.
We explored the relationship between magnesium supplementation, defecation, and cognitive performance in elite triathletes. In a carefully designed crossover trial, participants undertook cognitive tests after taking magnesium oxide and after defecation. This study highlighted an interesting potential connection between the state of our digestive system and cognitive abilities.
We found that after magnesium-induced defecation, participants completed cognitive tasks more quickly compared to when they had not defecated. Specifically, the average completion time for the cognitive test dropped significantly after defecation when magnesium was involved. While this suggests that magnesium can aid in relieving constipation, its role in improving overall cognitive function during athletics is also noteworthy.
Although we observed an increase in cognitive performance following magnesium supplementation, it’s important to note that no significant changes in blood flow or oxygen levels were detected in the brain during the test. Instead, we noted decreased oxygen levels in the digestive region, hinting at an increased demand for energy there.
Overall, our findings suggest a potential new avenue for enhancing cognitive function in athletes through magnesium to improve constipation. However, the direct effects of magnesium solely on constipation require further investigation.
Read More
9
Magnesium effectively aids constipation
The effect of food, vitamin, or mineral supplements on chronic constipation in adults: A systematic review and meta-analysis of randomized controlled trials.
We investigated how magnesium supplements affect chronic constipation through a systematic review of randomized controlled trials. The analysis included eight studies with a total of 787 participants. We focused on magnesium oxide among other treatment options and assessed its effectiveness in increasing stool frequency and improving consistency.
The findings were quite promising for magnesium oxide. Our results showed that participants who took magnesium experienced a boost in bowel movements, with an average increase of about 3.7 additional movements per week. This improvement in stool consistency was also noteworthy, scoring higher on the Bristol stool chart.
While other supplements like senna and kiwifruit were explored, they didn't significantly enhance symptoms of constipation in this analysis. Therefore, we suggest that magnesium oxide stands out in this study as a worthwhile option for managing chronic constipation. But it’s essential to remember that further research could help confirm these findings and explore the effects of whole food alternatives.
Read More
9
Magnesium aids cancer patient care
Oral application of magnesium-L-threonate enhances analgesia and reduces the dosage of opioids needed in advanced cancer patients-A randomized, double-blind, placebo-controlled trial.
We conducted a randomized, double-blind trial to assess how magnesium-L-threonate, a new compound, might help relieve constipation while enhancing the pain relief effects of opioids in patients with advanced cancer. During the study, patients receiving this treatment were compared with those taking a placebo, allowing us to clearly see the differences in outcomes.
As the trial progressed, we noticed significant improvements in the group taking magnesium-L-threonate. Notably, this treatment not only helped in managing pain more effectively but also significantly alleviated opioid-induced constipation—a common side effect of opioid use. The data indicated that patients on magnesium-L-threonate required lower doses of opioids for pain management while enjoying better gastrointestinal comfort.
Overall, our findings suggest that magnesium-L-threonate is a promising option in the palliative care landscape for cancer patients, addressing both pain relief and constipation, which can greatly enhance their quality of life.
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9
Magnesium may alleviate constipation
Efficacy of oral magnesium therapy in the treatment of chronic constipation in spastic cerebral palsy children: a randomized controlled trial.
We examined the effectiveness of oral magnesium sulfate in treating chronic constipation for children with spastic cerebral palsy. In our study, 100 children received either magnesium sulfate or a placebo for one month.
After this period, we noticed significant improvements in bowel movement frequency and stool consistency in the magnesium group, while the placebo group showed minimal change.
This treatment not only alleviated constipation but also reduced the distress of painful bowel movements for both children and their mothers.
Read More
9
Effective treatment for chronic constipation
Senna Versus Magnesium Oxide for the Treatment of Chronic Constipation: A Randomized, Placebo-Controlled Trial.
We explored the effectiveness of magnesium oxide (MgO) as a treatment for chronic constipation using a robust randomized, placebo-controlled trial. Over 28 days, participants received MgO, senna, or a placebo.
Both MgO and senna significantly improved bowel movement frequency and quality of life compared to placebo. About 68.3% of those using MgO reported symptom improvement, showcasing its potential as an effective osmotic agent alongside a stimulant laxative.
Importantly, there were no severe treatment-related side effects reported during the trial.
I utilized this under a doctor's guidance alongside a dietary programme to prevent waste from building up in the colon and intestines. I noticed its effects immediately after use; it resolved my constipation issue. A very useful and effective product.
Read More
9
Effective treatment
It is good and effective for treating constipation.
Read More
9
Relieves constipation
It successfully relieved constipation effectively.
Read More
7.5
No constipation
So far it's acceptable, but upon waking for my morning visit to the toilet, it seems to cause loose stools. The positive aspect is that it does prevent constipation.
Read More
7.5
Supports health
I have been using this product for a few months now, and I truly love it. It has significantly helped me with constipation and overall wellbeing. The ingredients are commendable, and the quality is satisfactory. The size and packaging are ideal.
Read More
Frequently Asked Questions
Constipation is a common condition characterized by infrequent bowel movements or difficulty passing stools. It is typically defined as having fewer than three bowel movements per week, leading to hard, dry stools that are painful or difficult to expel. This condition can be caused by a variety of factors, including diet, dehydration, lack of physical activity, and certain medications. Stress and lifestyle changes can also contribute, making it essential for individuals to identify the root causes of their constipation for effective relief.
To alleviate constipation, it’s recommended to increase fiber intake by consuming more fruits, vegetables, whole grains, and legumes, as well as ensuring adequate hydration throughout the day. Regular exercise can also promote healthy bowel function. If over-the-counter solutions such as fiber supplements or laxatives aren't effective, it's advisable to consult a healthcare provider, as chronic constipation can lead to complications and indicate underlying health issues. Keeping a consistent eating and bathroom schedule can also help regulate bowel movements.
Zinc Magnesium Aspartate, often referred to as ZMA, is a dietary supplement that combines three key ingredients: zinc, magnesium, and aspartic acid. This supplement is primarily marketed towards athletes and those looking to enhance their physical performance, as the components of ZMA are believed to support muscle recovery, improve sleep quality, and potentially boost testosterone levels. Zinc plays a crucial role in hormone production and immune function, while magnesium is essential for muscle relaxation and energy production. Aspartic acid, an amino acid, is thought to aid in the absorption of these minerals and may also support testosterone synthesis.
Many users report increased energy levels, improved sleep, and enhanced recovery from workouts when taking ZMA, making it a popular choice among fitness enthusiasts. However, scientific research on the effectiveness of ZMA is mixed. While some studies suggest benefits in testosterone levels and overall athletic performance, others show little to no significant impact. It's important to note that, like any supplement, individual responses can vary widely. If you're considering adding Zinc Magnesium Aspartate to your routine, it’s advisable to consult with a healthcare professional to ensure it's appropriate for your specific health needs and fitness goals.
Based on user reviews, the time it takes to notice results from this supplement for constipation can vary among individuals. Some users report experiencing immediate relief, suggesting that effects may be felt shortly after use. For instance, one reviewer noted, "I noticed its effects immediately after use; it resolved my constipation issue" Read Review. This indicates that for some, the supplement begins to work right away.
In contrast, other users have taken the supplement over an extended period and found consistent benefits. For example, one user stated, "I have been using this product for a few months now, and I truly love it" Read Review, implying that ongoing use may yield cumulative effects. Therefore, while immediate results can be experienced, some may find that consistent use enhances their overall digestive health.
The available scientific research suggests a supportive role for certain supplements in managing constipation, particularly focusing on magnesium and vitamin B6. For instance, studies indicate that dietary intake of magnesium, especially magnesium oxide, significantly improves bowel movement frequency and consistency, making it a common recommendation for those experiencing chronic constipation. One analysis found that participants taking magnesium had an average of 3.7 more bowel movements per week compared to those who did not, supporting its efficacy as a treatment option [10]. Additionally, magnesium hydroxide has been observed to expedite bowel movements in various patient populations, including those recovering from serious medical conditions [5] and is comparable to other treatments like polyethylene glycol for children [16].
Moreover, recent research associates vitamin B6 with a lower incidence of constipation, especially in certain populations like males and alcohol consumers, indicating that increased dietary intake could be beneficial [1]. While magnesium stands out with more robust evidence showing its effectiveness in managing constipation, vitamin B6 also shows promise, particularly when investigated alongside probiotics for enhanced gastrointestinal health [2]. Overall, both supplements may play valuable roles in alleviating constipation, although individual responses can vary, and further research could solidify these findings.
Based on user reviews, many individuals have reported significant improvements in their constipation symptoms after using this supplement. Users frequently mention experiencing immediate relief, with one user stating, "I noticed its effects immediately after use; it resolved my constipation issue" Read Review. Similarly, others affirm its effectiveness, noting comments such as "It successfully relieved constipation effectively" Read Review.
Furthermore, long-term users have reported cumulative benefits over time. One user expressed, "I have been using this product for a few months now, and I truly love it. It has significantly helped me with constipation" Read Review. While most users experienced positive outcomes, some cautioned about potential loose stools with use, indicating that experiences can vary widely among individuals Read Review. Overall, while many found it effective for managing constipation, individual results may differ.
Users have reported various experiences when combining this supplement with other supplements or dietary changes to manage constipation. Some have used the product under medical supervision while following a dietary plan, noting immediate benefits, as illustrated by one reviewer who said, "I noticed its effects immediately after use; it resolved my constipation issue" Read Review. This indicates that the supplement may work effectively in conjunction with a tailored dietary approach to address digestive health.
However, experiences can differ significantly among users. While many have praised its efficacy, others have reported side effects such as loose stools, particularly reported in the context of morning bathroom visits Read Review. Therefore, it seems that while this supplement can effectively alleviate constipation, the results can vary, especially when combined with additional dietary modifications or other supplements.
Users report positive experiences with Zinc Magnesium Aspartate for treating constipation, indicating it can be effective when used appropriately. One user noted immediate relief from constipation while utilizing the supplement under a doctor's guidance, suggesting that this product can indeed resolve issues related to waste buildup in the colon and intestines Read Review. Additionally, other users echoed similar sentiments, highlighting its effectiveness in providing relief from constipation Read ReviewRead Review.
However, some users cautioned about the possibility of loose stools, indicating that while the supplement prevents constipation, it might cause digestive irregularities for some individuals Read Review. Overall, it seems that the right dosage might require personalization based on individual tolerance, and ongoing user satisfaction points to its effectiveness when it aligns with the user's health profile Read Review.
10
Solves constipation
I utilized this under a doctor's guidance alongside a dietary programme to prevent waste from building up in the colon and intestines. I noticed its effects immediately after use; it resolved my constipation issue. A very useful and effective product.
7.5
Supports health
I have been using this product for a few months now, and I truly love it. It has significantly helped me with constipation and overall wellbeing. The ingredients are commendable, and the quality is satisfactory. The size and packaging are ideal.
9
Relieves constipation
It successfully relieved constipation effectively.
7.5
No constipation
So far it's acceptable, but upon waking for my morning visit to the toilet, it seems to cause loose stools. The positive aspect is that it does prevent constipation.
9
Effective treatment
It is good and effective for treating constipation.
9
Magnesium effectively aids constipation
The effect of food, vitamin, or mineral supplements on chronic constipation in adults: A systematic review and meta-analysis of randomized controlled trials.
We investigated how magnesium supplements affect chronic constipation through a systematic review of randomized controlled trials. The analysis included eight studies with a total of 787 participants. We focused on magnesium oxide among other treatment options and assessed its effectiveness in increasing stool frequency and improving consistency.
The findings were quite promising for magnesium oxide. Our results showed that participants who took magnesium experienced a boost in bowel movements, with an average increase of about 3.7 additional movements per week. This improvement in stool consistency was also noteworthy, scoring higher on the Bristol stool chart.
While other supplements like senna and kiwifruit were explored, they didn't significantly enhance symptoms of constipation in this analysis. Therefore, we suggest that magnesium oxide stands out in this study as a worthwhile option for managing chronic constipation. But it’s essential to remember that further research could help confirm these findings and explore the effects of whole food alternatives.
4
Magnesium aids constipation relief
Flaxseed powder and magnesium hydroxide syrup on the intestinal function of patients with acute myocardial infarction in intensive care units.
We investigated how magnesium hydroxide syrup affects constipation among patients recovering from acute myocardial infarction in an intensive care unit (ICU). Participants were divided into two groups: one received magnesium hydroxide syrup daily, while the other was given flaxseed powder. Our aim was to determine which treatment better supported bowel movements in these patients.
The findings revealed that magnesium hydroxide syrup indeed plays a role in managing constipation. Patients taking this syrup experienced their first bowel movement significantly sooner, averaging just under 25 hours. Although both treatments increased bowel movement frequency and improved stool consistency, the differences between the two groups were not statistically significant. In other words, while magnesium did help prompt quicker bowel movements, it wasn't drastically better than flaxseed powder in terms of the overall outcomes.
Overall, the study highlights magnesium hydroxide syrup as a viable option for easing constipation for patients in recovery, though its effectiveness is comparable to that of flaxseed powder. The time to the first defecation was notably quicker with magnesium, suggesting its potential utility in clinical settings where prompt relief is crucial.
5
Laxatives equally effective in children
Efficacy, safety, and acceptability of polyethylene glycol 3350 without electrolytes vs magnesium hydroxide in functional constipation in children from six months to eighteen years of age: A controlled clinical trial.
We conducted a year-long study comparing magnesium hydroxide and polyethylene glycol 3350 to see which is better for treating functional constipation in children aged 6 months to 18 years.
Both laxatives proved equally effective with no severe side effects reported. However, children over four years showed a preference for polyethylene glycol over magnesium, which was rejected more often, especially in older age groups.
For infants under four, magnesium remains a strong first-choice option.
8
Vitamin B6 may reduce constipation
Association between dietary vitamin B6 intake and constipation: a population-based study.
We aimed to explore the possible relationship between dietary vitamin B6 intake and constipation by analyzing data from a large health and nutrition survey. Our study involved 3,643 participants, including 270 individuals diagnosed with chronic constipation.
Through careful examination using logistic regression, we found that higher dietary intake of vitamin B6 was associated with a lower incidence of constipation. Specifically, our results showed that individuals in the highest intake group had about 15% lower odds of experiencing constipation compared to those with the lowest intake.
Additionally, the findings revealed that this beneficial effect of vitamin B6 was particularly significant among males and those who consume alcohol. These results suggest that increasing our dietary intake of this important vitamin could help manage or prevent constipation.
Overall, we observed an inverse relationship between dietary vitamin B6 and chronic constipation, highlighting the need for more extensive research to better understand its long-term effects.
7
Vitamin B6 and probiotics aid constipation
Effects of and on Gut Microbiota in Patients with Lactose Intolerance and Persisting Functional Gastrointestinal Symptoms: A Randomised, Double-Blind, Cross-Over Study.
We aimed to explore how vitamin B6, combined with probiotics, might help alleviate constipation, particularly for individuals with lactose intolerance who continue to experience gastrointestinal symptoms. In our randomized, double-blind, cross-over study, we tested a unique formulation containing probiotic strains BB536 and HN001, alongside vitamin B6, in 23 lactose intolerant participants over a month.
Our results indicated that this combination was effective in significantly reducing bloating and improving constipation symptoms compared to a placebo. Specifically, we found that the inclusion of vitamin B6 played a role in this positive outcome. While it is true that we cannot isolate vitamin B6's effect on constipation entirely, its presence alongside the probiotics contributed to a notable improvement in the subjects' symptoms.
Moreover, dietary changes and the introduction of these supplements led to alterations in the gut microbiome, favoring bacteria that support lactose digestion. This suggests a multifaceted approach in addressing gastrointestinal discomforts, highlighting the importance of both probiotics and vitamin B6 in managing symptoms for those affected by lactose intolerance.
References
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Vitellio P, Celano G, Bonfrate L, Gobbetti M, Portincasa P, et al. Effects of and on Gut Microbiota in Patients with Lactose Intolerance and Persisting Functional Gastrointestinal Symptoms: A Randomised, Double-Blind, Cross-Over Study. Nutrients. 2019;11. doi:10.3390/nu11040886
Wei CC, Harris MB, Ye M, Nicholls A, Alkhatib A, et al. Defecation after magnesium supplementation enhances cognitive performance in triathletes. Sports Med Health Sci. 2025;7:102. doi:10.1016/j.smhs.2024.04.001
Watanabe N, Itano A, Ando M, Kawahara M. Effect of reduced daily magnesium oxide doses on laxative effect: a single-center retrospective study. J Rural Med. 2024;19:192. doi:10.2185/jrm.2023-038
Amjadi Suraki S, Bagheri-Nesami M, Nabati M, Moosazadeh M, Habibi E. Flaxseed powder and magnesium hydroxide syrup on the intestinal function of patients with acute myocardial infarction in intensive care units. Caspian J Intern Med. 2024;15:234. doi:10.22088/cjim.15.2.234
Nagamine T. Effect of magnesium oxide with probiotics on bowel movements in elderly orthopedic patients with chronic constipation: a retrospective chart review. Biosci Microbiota Food Health. 2024;43:1. doi:10.12938/bmfh.2023-040
Park CW, Lee J, Hong YH, Kim YS, Suh HJ, et al. Coadministration of Lactulose with Probiotics Ameliorates Loperamide-Induced Constipation in Mice. Prev Nutr Food Sci. 2023;28:427. doi:10.3746/pnf.2023.28.4.427
Ishii H, Sawada R, Shiomi M, Shibuya K. A case-control study showing low creatinine clearance and high magnesium intake as risk factors for hypermagnesemia in older individuals. Magnes Res. 2023;36:23. doi:10.1684/mrh.2023.0513
Sasaki H, Hayashi K, Imamura M, Hirota Y, Hosoki H, et al. Combined resistant dextrin and low-dose Mg oxide administration increases short-chain fatty acid and lactic acid production by gut microbiota. J Nutr Biochem. 2023;120:109420. doi:10.1016/j.jnutbio.2023.109420
van der Schoot A, Creedon A, Whelan K, Dimidi E. The effect of food, vitamin, or mineral supplements on chronic constipation in adults: A systematic review and meta-analysis of randomized controlled trials. Neurogastroenterol Motil. 2023;35:e14613. doi:10.1111/nmo.14613
Suzuki S, Obara T, Ishikawa T, Noda A, Matsuzaki F, et al. No association between major congenital malformations and exposure to Kampo medicines containing rhubarb rhizome: A Japanese database study. Front Pharmacol. 2023;14:1107494. doi:10.3389/fphar.2023.1107494
Kistemaker KRJ, de Graeff A, Crul M, de Klerk G, van de Ven PM, et al. Magnesium hydroxide versus macrogol/electrolytes in the prevention of opioid-induced constipation in incurable cancer patients: study protocol for an open-label, randomized controlled trial (the OMAMA study). BMC Palliat Care. 2023;22:22. doi:10.1186/s12904-023-01143-2
Wu S, Jin T, Ma B, Ji Y, Huang X, et al. Oral application of magnesium-L-threonate enhances analgesia and reduces the dosage of opioids needed in advanced cancer patients-A randomized, double-blind, placebo-controlled trial. Cancer Med. 2023;12:4343. doi:10.1002/cam4.4922
Maezawa M, Inoue M, Satake R, Wakabayashi W, Oura K, et al. Effect of acid suppressant medications on the laxative action of magnesium preparations in patients with opioid-induced constipation: A pharmacovigilance analysis of the FDA Adverse Event Reporting System. Pharmazie. 2023;78:245. doi:10.1691/ph.2023.3624
Takemura M, Niki K, Miyaguchi S, Ueda M. Naldemedine-laxative combination: retrospective inpatient study. BMJ Support Palliat Care. 2024;13:e816. doi:10.1136/spcare-2022-003685
Worona-Dibner L, Vázquez-Frias R, Valdez-Chávez L, Verdiguel-Oyola M. Efficacy, safety, and acceptability of polyethylene glycol 3350 without electrolytes vs magnesium hydroxide in functional constipation in children from six months to eighteen years of age: A controlled clinical trial. Rev Gastroenterol Mex (Engl Ed). 2023;88:107. doi:10.1016/j.rgmxen.2021.12.005
de Campos GRC, Sandy NS, Lomazi EA, Bellomo-Brandao MA. Management of children with functional constipation referred to tertiary care. J Pediatr (Rio J). 2022;98:289. doi:10.1016/j.jped.2021.06.006
Rao SSC, Brenner DM. Efficacy and Safety of Over-the-Counter Therapies for Chronic Constipation: An Updated Systematic Review. Am J Gastroenterol. 2021;116:1156. doi:10.14309/ajg.0000000000001222
Hassanein SMA, Deifallah SM, Bastawy HA. Efficacy of oral magnesium therapy in the treatment of chronic constipation in spastic cerebral palsy children: a randomized controlled trial. World J Pediatr. 2021;17:92. doi:10.1007/s12519-020-00401-0
Morishita D, Tomita T, Mori S, Kimura T, Oshima T, et al. Senna Versus Magnesium Oxide for the Treatment of Chronic Constipation: A Randomized, Placebo-Controlled Trial. Am J Gastroenterol. 2021;116:152. doi:10.14309/ajg.0000000000000942
Kubota M, Ito K, Tomimoto K, Kanazaki M, Tsukiyama K, et al. Lactobacillus reuteri DSM 17938 and Magnesium Oxide in Children with Functional Chronic Constipation: A Double-Blind and Randomized Clinical Trial. Nutrients. 2020;12. doi:10.3390/nu12010225
Ohkubo H, Yoshihara T, Misawa N, Ashikari K, Fuyuki A, et al. Relationship between Stool Form and Quality of Life in Patients with Chronic Constipation: An Internet Questionnaire Survey. Digestion. 2021;102:147. doi:10.1159/000502815
Dupont C, Constant F, Imbert A, Hébert G, Zourabichvili O, et al. Time to treatment response of a magnesium- and sulphate-rich natural mineral water in functional constipation. Nutrition. 2019;65:167. doi:10.1016/j.nut.2019.02.018
Tsuji S, Horiuchi A, Tamaki M, Ichise Y, Kajiyama M, et al. Effectiveness and safety of a new regimen of polyethylene glycol plus ascorbic acid for same-day bowel cleansing in constipated patients. Acta Gastroenterol Belg. 2018;81:485.
Nacci C, Fanelli M, Potenza MA, Leo V, Montagnani M, et al. Carbon monoxide contributes to the constipating effects of granisetron in rat colon. World J Gastroenterol. 2016;22:9333.