A low sex drive in men is very common and can stem from various factors like stress, fatigue, or hormonal imbalances. If a blood test reveals low testosterone, a doctor may prescribe testosterone replacement therapy. Supplements like zinc, L-arginine, or ginseng are sometimes used, though clinical evidence is limited. Note that medications like sildenafil treat erectile function, not libido. I highly recommend that your husband schedule a visit with a doctor. They can check his hormone levels and safely guide him toward the right treatment, lifestyle changes, or counselling.