Can withdrawal symptoms of Prozac lay dormant until about a month later?

Prozac withdrawal. Prozac has a very long half-life, about 16 days, which means the blood level drops gradually over several weeks. Therefore, in about a month's time, symptoms may re-appear for which you took this med initially, eg, irritability, anxiety, depression. Stopping Prozac should always be tapered slowly under doctor supervision for this reason. Check with prescribing doctor to review how you're feeling.