Fox news has a quetion and answer forum with an MD on Sunday and one of the questions was what causes low libido . The doctor said that it often results from a deficiency of dopamine . One of the many adverse effects of antidepressants is drasticly lowered dopamine.People with Parkinson's disease are deficient in dopamine and when they are given drugs that increase dopamine , one effect is increased libido . People who are low in dopamine also have chronic muscle stiffness and pain , similar to Parkinson's victims and this probably accounts for why I and so many other users of antidepressants have chronic pain. My chiropractor , who is a senior citizen , said that decades ago he never saw young people whose muscles were rigid . That is probably because thay weren't on antidepressants back in the 70s.The problem with taking anything that increases dopamine is that it ultimately makes the problems worse after improving them temporarily . I know people who have Parkinsons and their doctors admit that their medications will hasten the progression of the disease , whch is true of almost all medications.