Sexual dysfunction is a known side effect of antidepressant treatment (ADT), affecting up to 58–73% of those who receive ADT, potentially affecting antidepressant adherence. Consequently, it is vital to develop novel treatments that target antidepressant-induced sexual dysfunction.

We examined whether adjunctive S-adenosyl-L-methionine (SAMe) is associated with greater improvement in sexual functioning than adjunctive placebo by measuring changes in sexual functioning using the Massachusetts General Hospital–Sexual Functioning Questionnaire (MGH-SFQ) during a 6-week, single-center, randomized, double-blind trial of SAMe augmentation for SSRI/SNRI- nonresponders.

Controlling for the degree of arousal dysfunction at baseline as well as the degree of change in HDRS-17 scale scores during the course of the study, men treated with adjunctive SAMe demonstrated significantly lower arousal dysfunction at endpoint than those treated with adjunctive placebo. In addition, controlling for the degree of erectile dysfunction at baseline as well as the degree of change in HDRS-17 scale scores, men treated with adjunctive SAMe demonstrated significantly lower erectile dysfunction at endpoint than those treated with adjunctive placebo.

In the present study, we have observed that adjunctive SAMe can have positive benefit on male arousal and erectile dysfunction, independent of improvement in depressive symptoms. These findings are preliminary, and warrant replication.

NCT00093847; titled ‘Optimizing the Effectiveness of Selective Serotonin Reuptake Inhibitors (SSRIs) in Treatment-Resistant Depression’, accessible at: http://clinicaltrials.gov/ct2/show/NCT00093847.