Is it permissible for me to take the drug "Prozac" to treat obsessive-compulsive disorder, given that one of its potential side effects initially is an increase in anxiety, which is one of the causes of obsessive-compulsive disorder?

These obsessive thoughts do no harm as long as the person dislikes them and is averse to them. The best cure for them is to turn away from them and ignore them completely. There is no objection to taking the mentioned medication if it is beneficial and this has been proven by the experience of trustworthy doctors. It is advisable to consult a trustworthy doctor and adhere to the treatment schedule.