- What are antidepressants (depression medications)?
- List of the types of antidepressants
- Selective serotonin reuptake inhibitors (SSRIs)
- What are the side effects of SSRIs?
- List of SNRIs
- What are the side effects and drug interactions of SNRIs?
- What are serotonin and norepinephrine reuptake inhibitors (SNRIs)? How do they work?
- What are tricyclic antidepressants (TCAs)? What are the side effects?
- Which drugs interact with TCAs?
- List of TCAs
- What are monoamine oxidase inhibitors (MAOIs)? What are the side effects?
- Which other drugs treat depression?
- How do antidepressants work (mechanism of action)?
What are antidepressants (depression medications)?
- Depression medications (antidepressant drugs) are the most commonly prescribed drug class for treating depression.
- Depression is a serious condition that often can be effectively treated with available therapies. Many antidepressants have been developed over the years. The newer classes of antidepressants are tolerated better and are associated with fewer drug interactions than the older types of antidepressants.
- Antidepressant medication side effects and drug interactions are barriers to successful treatment for depression. Some side effects of antidepressants resolve with continued use while other side effects can be managed by dose reduction or adding other therapies. Appropriate management of side effects and avoiding drugs and alcohol that may interact with antidepressants may improve the success of depression therapy.
List of the types of antidepressants
Selective serotonin reuptake inhibitors (SSRIs)
Selective serotonin reuptake inhibitors or SSRIs are the most widely used class of antidepressants. They work by increasing the level of serotonin in the brain. Unlike MAOIs and TCAs, SSRIs do not significantly affect norepinephrine levels in the brain. SSRIs also have fewer and milder side effects, fewer drug interactions, and are much less likely to be associated with suicide than TCAs.
What are the side effects of SSRIs?
Common side effects of SSRIs include:
- Headaches: SSRIs cause headaches and dose-related nausea, vomiting, and diarrhea that improve with continued treatment.
- Insomnia, restlessness, agitation: Insomnia, restlessness, and agitation-which decrease over time-also are associated with SSRIs. Insomnia can be treated with low dose (50-100 mg) trazodone (Desyrel) at bedtime and agitation may be managed by reducing the SSRI dose or treating with anti-anxiety drugs.
- Sexual dysfunction: SSRIs also are associated with sexual dysfunction. Symptoms of sexual dysfunction in men may be treated with:
- Weight gain or loss: Over time, weight loss or weight gain has been associated with SSRIs. Patients may experience weight loss initially but quickly regain weight.
Quick GuidePhysical Symptoms of Depression in Pictures
List of SNRIs
What are the side effects and drug interactions of SNRIs?
Drug interactions and side effects associated with SNRIs are similar to those seen with SSRIs, for example:
What are serotonin and norepinephrine reuptake inhibitors (SNRIs)? How do they work?
Serotonin and norepinephrine reuptake inhibitors or SNRIs are the newest class of antidepressants. SNRIs work by increasing the levels of serotonin and norepinephrine that are active in the brain. Serotonin and norepinephrine are produced by nerves and released into the surrounding tissues where they can attach to nearby receptors on other nerves, thereby stimulating the other nerves. The released serotonin and norepinephrine then are taken up and released again by the nerves that produce them. SNRIs block the uptake ("reuptake") of the serotonin and norepinephrine so that more of the serotonin and norepinephrine are free in the tissues surrounding the nerves.
What are tricyclic antidepressants (TCAs)? What are the side effects?
TCAs have been in use since the 1950s when imipramine (Tofranil) was shown to be effective for treating depression. TCAs primarily work by increasing the level of norepinephrine in the brain and to a lesser extent serotonin levels. Some TCAs also are antihistamines (block the action of histamine) or anticholinergic (block the action of acetylcholine, a neurotransmitter), and these additional actions allow for uses of TCAs other than for treating depression as well as additional side effects.
What are the side effects of tricyclic antidepressants (TCA) medications?
Serious side effects and adverse events of tricyclic antidepressants include:
- TCAs are associated with a number of cardiovascular (heart and blood vessels) effects such as orthostatic hypotension and abnormal heart rates and rhythms. Orthostatic hypotension may lead to dizziness, falls, and fractures. Orthostatic hypotension may be managed by reducing or discontinuing the TCA dose, increasing salt intake, or treatment with steroids.
- If abnormal heart rhythms develop, TCAs should be discontinued. TCAs are not a good choice for patients with cardiovascular conditions.
- TCAs have anticholinergic effects, which manifest as dry mouth, constipation, urinary hesitation, sexual dysfunction, increased heart rate, and visual disturbance. Desipramine (Norpramin) and nortriptyline (Pamelor) cause less anticholinergic effects than other TCAs.
- TCAs should be avoided in people with prostatic hypertrophy, cognitive impairment, or narrow-angle glaucoma because drugs with anticholinergic side effects can worsen symptoms of these conditions.
Some side effects and treatments of tricyclic antidepressants include:
- Dry mouth relief: Sugarless gum or candy, or pilocarpine (Salagen) oral rinse may alleviate dry mouth.
- Constipation: Constipation may be relieved by bulk laxatives and increased drinking hydrating fluids.
- Urinary retention: Urinary hesitation may be treated with bethanechol (Urecholine).
- Visual disturbances: Visual disturbances may be treated with pilocarpine eye drops.
- Sexual dysfunction: Erectile dysfunction (ED, impotence) may be managed with sidenafil (Viagra), reducing the TCA dose, or discontinuing the TCA. Yohimbine, ginkgo, bethanechol, and neostigmine have also been used for managing TCA induced sexual dysfunction in some patients.
Side effects that are more serious include:
- TCAs also cause sedation. Amitriptyline (Elavil, Endep), doxepin (Sinequan), and trimipramine (Surmontil) are more sedating than amoxapine and desipramine (Norpramin). Sedation may improve after a few weeks of treatment. Sedating TCAs may be beneficial for depressed patients who have insomnia.
- Dose dependent and reversible weight gain may occur during TCA treatment. Amitriptyline (Elavil, Endep) causes weight gain more often than desipramine (Norpramin).
Daily Health News
Which drugs interact with TCAs?
- TCAs may inhibit the antihypertensive effect of clonidine (Catapres). Therefore, combining TCAs with clonidine may lead to dangerous elevations in blood pressure.
- TCAs may affect the heart's electrical conduction system. Combining TCAs with drugs that also affect the heart's conduction system (for example, disopyramide [Norpace], pimozide [Orap], procainamide [Pronestyl, Procan SR, Procanbid]) may increase the frequency and severity of an abnormal heart rate and rhythm.
- Combining TCAs with carbamazepine (Tegretol) may result in lower TCA blood levels because carbamazepine increases the breakdown of TCAs, potentially reducing their effect.
- TCAs may increase the blood pressure elevating effect of epinephrine, norepinephrine, dopamine, phenylephrine, and dobutamine.
- Cimetidine (Tagamet) may reduce the breakdown of some TCAs, for example, amitriptyline (Elavil, Endep), increasing the level of the TCA in the body, and potentially leading to increased side effects. As mentioned previously, TCAs should not be combined with MAOIs.
List of TCAs
- amitriptyline (Elavil and Endep are discontinued brands in the US)
- clomipramine (Anafranil)
- desipramine (Norpramin)
- doxepin (Sinequan and Adapin are discontinued brands in the US)
- imipramine (Tofranil)
- nortriptyline (Pamelor; Aventyl is a discontinued brand in the US)
- protriptyline (Vivactil)
- trimipramine (Surmontil)
What are monoamine oxidase inhibitors (MAOIs)? What are the side effects?
Monoamine oxidase inhibitors or MAOIs were the first class of antidepressants to be developed. They fell out of favor because of concerns about interactions with certain foods and numerous drug interactions. MAOIs elevate the levels of norepinephrine, serotonin, and dopamine by inhibiting an enzyme called monoamine oxidase. Monoamine oxidase breaks down norepinephrine, serotonin, and dopamine. When monoamine oxidase is inhibited, norepinephrine, serotonin, and dopamine are not broken down, increasing the concentration of all three neurotransmitters in the brain.
Monoamine oxidase also breaks down tyramine, a chemical present in aged cheese, wines, and other aged foods. Since MAOIs inhibit monoamine oxidase, they decrease the breakdown of tyramine from ingested food, increasing the level of tyramine in the body. Excessive tyramine can elevate blood pressure and cause a hypertensive crisis. Patients treated with MAOIs should adhere to recommended dietary modifications that reduce the intake of tyramine. Interestingly, the 6 mg/24 hour dose of selegiline transdermal system (EMSAM, and MAO inhibitor) does not require dietary restrictions because at this dose EMSAM does not substantially inhibit tyramine. Higher selegiline transdermal system (EMSAM) doses require dietary restrictions.
What are the side effects of MAOIs?
- MAOIs are associated with headache and insomnia, which may decrease with continued use. Headaches may require treatment with nonsteroidal anti-inflammatory drugs (for example, ibuprofen), and insomnia, which may require treatment with benzodiazepines, for example, diazepam (Valium), or other drugs for insomnia.
- Because MAOIs stimulate the nervous system, they may be beneficial for depressed patients who over sleep or are fatigued.
- Hypertension may occur during therapy with MAOIs. Therefore, blood pressure should be monitored periodically during MAOI treatment. Hypertensive crisis may occur when MAOIs are combined with tyramine containing foods or drugs that constrict blood vessels.
Symptoms of hypertensive crises include
- heart palpitation,
- chest pain,
- increased or decreased heart rate,
- neck stiffness or soreness,
- sweating, and
- dilated pupils.
Other side effects and adverse events of MAOIs include:
- Bleeding in the brain also may occur. Patients should be aware of signs and symptoms of hypertensive crisis and should seek immediate medical treatment if these signs or symptoms are present. Hypertensive crisis may be managed with nitroprusside (Nitropress), labetalol (Normodyne, Trandate), or phentolamine.
- Orthostatic hypotension (feeling faint upon standing due to decreased blood flow to the brain) also occurs. Patients should rise slowly from a sitting position to reduce the effect of orthostatic hypotension. Orthostatic hypotension may be treated with steroids.
- Some patients may experience peripheral edema (swelling of the lower legs and ankles) which can be improved by wearing support stockings.
- MAOIs also are associated with sexual side effects such as:
Sexual side effects may diminish with time or a reduction in dose.
Which other drugs treat depression?
How do antidepressants work (mechanism of action)?
Antidepressants (depression medications) are the most prescribed class of drugs for depression. The exact mechanism of action of antidepressants is unknown.
- The prevailing theory is that antidepressants increase the concentration of one or more brain chemicals (neurotransmitters) that nerves in the brain use to communicate with one another.
- The neurotransmitters affected by antidepressants are norepinephrine, serotonin, and dopamine.
- The different classes of antidepressants differ in the neurotransmitters they affect. This determines some of their side effects and potential drug interactions.
- All available antidepressants are effective, and for most cases of depression, there is no good evidence that any antidepressant is more effective than another is.
- Side effects, potential drug interactions, and therapy compliance are major factors that influence a doctor's selection of antidepressants for a patient.
Depression medications or antidepressants are drugs prescribed for treating depression. There are several types of drug classes of antidepressants including tricyclic antidepressants (TCAs), selective serotonin reuptake inhibitors (SSRIs), serotonin norepinephrine reuptake inhibitors (SNRIs), and monoamine oxidase inhibitors (MAOIs).
Side effects depend on the medication prescribed. Drug interactions, warnings and precautions, and pregnancy and breastfeeding safety should be reviewed prior to taking any medication.
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Treatment & Diagnosis
Medications & Supplements
- Anticholinergic and Antispasmodic Drugs
- Lexapro (escitalopram)
- Sertraline (Zoloft)
- Cymbalta (duloxetine) vs. Effexor (XR, venlafaxine) Differences in Uses, Dose, and Withdrawal
- Anxiolytics (for Anxiety) Drug Class Side Effects
- bupropion (Wellbutrin, Wellbutrin SR, Wellbutrin XL, Zyban, Aplenzin, Fortivo XL, Zyban)
- duloxetine, Cymbalta
- citalopram, Celexa
- amitriptyline (Elavil, Endep)
- venlafaxine, Effexor XR (Effexor has been discontinued in the US)
- montelukast, Singulair
- paroxetine, Paxil, Paxil CR, Pexeva
- fluoxetine, Prozac, Sarafem, Prozac Weekly
- ADD or ADHD Medications
- fluvoxamine (Luvox and Luvox CR have been discontinued)
- desvenlafaxine (Pristiq, Khedezla)
- Buspar vs. Zoloft (Differences between Side Effects and Uses)
- doxepin (Sinequan and Adapin are discontinued brand in the US; Silenor)
- nortriptyline, Pamelor, Aventyl - has been discontinued in the U.S.
- St. John's Wort (Hypericum perforatum)
- clomipramine (Anafranil)
- dimethyl fumarate (Tecfidera)
- desipramine, Norpramin
- nefazodone, Serzone
- imipramine, Tofranil, Tofranil-PM
- trimipramine (Surmontil)
- teriflunomide (Aubagio)
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- Grateful Teens May Have Less Risk for Depression, Other Problems
- Brain Changes Seen in Postpartum Depression
- Medicare Coverage Gap May Cause Seniors to Forgo Antidepressants
- Vitamin D Deficiency Linked to Depression
- More Mental Health Woes in College Kids Who Abuse Prescription Drugs
- Scientists Spot More Migraine Genes
- Fear of the Dark May Trigger Insomnia
- Exercise Appears to Ease Nerve-Damage Pain in Rat Study
- More Mental Health Care Urged for Kids Who Self-Harm
- Most Children With Autism Diagnosed at 5 or Older
- Sleepwalking May Be More Common Than You Think
- Bedwetting Misunderstood but Often Treatable
- Benefits of Antidepressants in Autism Overstated?
- After Hospitalization, Men More Likely to Show Up in ER
- Antidepressants Aid Depressed Parkinson's Patients
- Minorities, Medicare Recipients Less Likely to Get Antidepressants
- Planning Pregnancy May Cut Birth Defects
- Prenatal Antipsychotic Drugs Linked to Motor Delays: Study
- Sleep Apnea Linked to Depression
- Depression After Stroke Too Often Goes Untreated
- FDA Adds More Warnings to Antidepressant's Label
- Antidepressants May Raise Risk for Pregnancy Complication
- Study Explains How Shock Therapy Might Ease Severe Depression
- Medication Leading Cause of Child Poisoning in U.S.
- Generic Lexapro Antidepressant Approved by FDA
- Mothers on Antidepressants Less Likely to Breast-Feed: Study
- Severe PMS May Last Longer Than Thought
- Moms' Antidepressants May Affect Babies' Head Size: Study
- Prescription Meds Can Put on Unwanted Pounds
- Could a Statin Lower Your Risk for Depression?
- New Guidelines to Help Breast Cancer Survivors
- Is Grief an Illness? The Debate Heats Up
- Antidepressants May Not Raise Suicide Risk in Youth: Study
- U.S. Soldiers Face Host of Mental Health Issues
- Antidepressants Might Raise Fall Risk in Nursing Homes
- Certain Antidepressants May Raise Lung Risk in Newborns
- Widowers Who Stay Single Might Face More Mental Health Woes
- Medicaid Spending for Depression Rose in Past Decade
- Newer Antidepressants Work Equally Well, Study Finds
- Treatment Shows Promise for Premature Ejaculation
- Prozac May Lessen Autism Symptom in Adults
- Use of Antidepressants on the Rise in the U.S.
- Depression Raises Women's Stroke Risk
- Study: Antipsychotic Drug Does Not Help Veterans With PTSD
- Talk Therapy Plus Self-Help May Fight Pain
- Americans Are Flocking to Alternative Therapies
- Antidepressant Use in Pregnancy: Autism Risk?
- ER Visits for Drug-Related Suicide Attempts Up in Men
- Lists of Prescription Meds' Side Effects Keep Growing: Study
- Recall of Generic Citalopram, Finasteride
- Drug-Related Poisonings Land Many in ER
- Depression Rising, but Psychotherapy Declines
- Older Antidepressants Linked to Heart Risk
- Seizure and Pain Drug May Treat Hot Flashes
- SAM-e May Boost Effects of Antidepressants
- Prescription Drug Use on the Rise in U.S.
- Stop-Smoking Aid Chantix Sparks Safety Concerns
- Survey: Talk Therapy as Good as Antidepressants
- Drug Tests Often Trigger False Positives
- Cataracts From Antidepressants?
- Acupuncture Eases Depression in Pregnancy
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