Types of antidepressants

Certain brain chemicals called neurotransmitters are associated with depression — particularly serotonin (ser-o-TOE-nin), norepinephrine (nor-ep-ih-NEF-rin) and dopamine (DOE-puh-meen). Most antidepressants relieve depression by affecting these neurotransmitters, sometimes called chemical messengers, which aid in communication between brain cells. Each type (class) of antidepressant affects these neurotransmitters in slightly different ways.

Many types of antidepressant medications are available to treat depression, including:

• Selective serotonin reuptake inhibitors (SSRIs). Doctors often start by prescribing an SSRI. These medications generally cause fewer bothersome side effects and are less likely to cause problems at higher therapeutic doses than other types of antidepressants are. SSRIs include fluoxetine (Prozac), paroxetine (Paxil, Pexeva), sertraline (Zoloft), citalopram (Celexa) and escitalopram (Lexapro).
• Serotonin and norepinephrine reuptake inhibitors (SNRIs). Examples of SNRI medications include duloxetine (Cymbalta), venlafaxine (Effexor XR), desvenlafaxine (Pristiq) and levomilnacipran (Fetzima).
• Atypical antidepressants. These medications don't fit neatly into any of the other antidepressant categories. More commonly prescribed antidepressants in this category include trazodone, mirtazapine (Remeron), vortioxetine (Trintellix), vilazodone (Viibryd) and bupropion (Wellbutrin SR, Wellbutrin XL, others). Bupropion is one of the few antidepressants not frequently associated with sexual side effects.
• Tricyclic antidepressants. Tricyclic antidepressants — such as imipramine (Tofranil), nortriptyline (Pamelor), amitriptyline, doxepin and desipramine (Norpramin) — tend to cause more side effects than newer antidepressants. So tricyclic antidepressants generally aren't prescribed unless you've tried other antidepressants first without improvement.
• Monoamine oxidase inhibitors (MAOIs). MAOIs — such as tranylcypromine (Parnate), phenelzine (Nardil) and isocarboxazid (Marplan) — may be prescribed, often when other medications haven't worked, because they can have serious side effects. Using an MAOI requires a strict diet because of dangerous (or even deadly) interactions with foods — such as certain cheeses, pickles and wines — and some medications, including pain medications, decongestants and certain herbal supplements. Selegiline (Emsam), an MAOI that you stick on your skin as a patch, may cause fewer side effects than other MAOIs. These medications can't be combined with SSRIs.
• Other medications. Your doctor may recommend combining two antidepressants, or other medications may be added to an antidepressant to enhance antidepressant effects.