Anti-depressants are defined as a substance that is used in the treatment of mood disorders, as characterized by various manic or depressive affects. There are several types of antidepressants including selective serotonin reuptake inhibitors, these medications are safer and generally cause fewer bothersome side effects than other types of antidepressants, serotonin and norepinephrine reuptake inhibitors such as duloxetine, venlafaxine, and desvenlafaxine, norepinephrine and dopamine reuptake inhibitors, one of the few antidepressants not frequently associated with sexual side effects, atypical antidepressants, tricyclic antidepressants, and monoamine oxidase inhibitors. When prescribing antidepressants doctors taking into account the symptoms a person experiences, possible side effects, if it worked for a close relative, interaction or altercation with other medications, cost and health insurance, and other health conditions. Symptoms of depression can vary, and one antidepressant may relieve certain symptoms better than another. Side effects of antidepressants vary from one medication to another and from person to person. Bothersome side effects, such as dry mouth, weight gain or sexual side effects, can make it difficult to stick with treatment. How a medication worked for a first-degree relative, such as a parent or sibling, can indicate how well it might work for another closely related relative. Some antidepressants can cause dangerous reactions when taken with other medications. Some antidepressants can be expensive, especially if there's no generic version available. Some antidepressants may cause problems if a person has certain mental or physical health conditions. Most antidepressants are generally safe, but the Food and Drug Administration requires that all antidepressants carry black box warnings, the strictest warnings for prescriptions. In some cases, children, teenagers and young adults under 25 may have an increase in suicidal thoughts or behavior when taking antidepressants, especially in the first few weeks after starting or when the dose is changed. Being patient is essential when trying a new antidepressant. Once a person and their doctor have selected an antidepressant, it may take six or more weeks for it to be fully effective. With some medications, the full dosage can be taken immediately. While others, a person may need to gradually increase their dosage. Talk to a doctor or therapist about coping with depression symptoms while waiting for the medications to take effect. Many antidepressants cause side effects that improve with time. For example, initial side effects when starting an SSRI can include dry mouth, nausea, loose bowel movements, headache and insomnia, but these symptoms usually go away as your body adjusts to the antidepressant. In many cases, combining an antidepressant with mental health counseling is more effective than taking an antidepressant alone. It can also help prevent the depression from returning once a person feeling better. Some antidepressants can cause significant withdrawal-like symptoms unless a person slowly tapers off their dose. Quitting suddenly may cause a sudden worsening of depression. Avoid alcohol and illegal drugs; though they may seem like a better alternative, studies have shown that combining antidepressants and illegal substance or alcohols worsens depression and makes it harder to treat.