Virtually all medicines can cause side effects. Typically, unwanted effects increase when the dose rises. Side effects usually vary from one drug to another and are especially variable between different medication classes. If you have previously taken a medicine and done well or poorly or had bothersome side effects, be sure to tell the doctor what happened. This should affect the choice of your next prescription. If you have never taken an antidepressant, discuss with your doctor which groups have which side effects. Let your doctor know which effects you particularly wish to avoid, such as sedation or sexual disruption.