Enjoy other SSRI�s, Prozac can be a medication that will take close to five weeks in order to reach its optimum potential. The medication can be prescribed from only a small amount to 5mg per day to 80mg per day based on the issues that patient is experiencing and how responsive a man is when two to help eight months. Prozac can be installed short phrase for as few as three a long time or may be safely used long term if a doctor deems necessary.