We conducted a clinical trial to determine how effective local injections of vitamin B12, specifically methylcobalamin, combined with lidocaine, are in treating pain caused by shingles, known as subacute ophthalmic herpetic neuralgia (SOHN). One hundred and five patients participated, each experiencing moderate to severe pain. They were divided into three groups to receive different treatments: a local injection of methylcobalamin and lidocaine, an intramuscular injection of methylcobalamin with local lidocaine, or oral methylcobalamin alongside local lidocaine.
Throughout the four-week trial, we observed significant pain relief among all groups, but the local injection group reported the most substantial reduction in pain. For example, their pain scores dropped from an average of 6.7 to 2.8, while the other groups showed less improvement. Additionally, most people receiving local injections experienced a clinically meaningful reduction in pain, which wasn't as pronounced in the other treatment groups.
Those in the local injection group also reported significantly less need for pain relief medication by the end of the study, signaling a potential improvement in their overall quality of life while undergoing treatment. Overall, our findings suggest that local methylcobalamin injections, when used with lidocaine, might provide superior pain relief compared to systemic or oral options in patients suffering from shingles-related pain.