Amitriptyline Side Effects

Kristin Hall, FNP

Medically reviewed by Kristin Hall, FNP

Written by Our Editorial Team

Last updated 4/9/2022

An estimated 21 million American adults suffer from depression every year — about 8.4 percent of the entire US adult population. Many of these people are prescribed antidepressants to treat their symptoms and assist with the recovery process. 

Amitriptyline is a medication for depression. It belongs to an older class of medications referred to as tricyclic antidepressants. Although it’s rarely used as a first-line treatment for depression, you may be prescribed amitriptyline if other, newer antidepressants aren’t effective for you.

Amitriptyline can cause side effects. In fact, as an older type of antidepressant, amitriptyline has a more considerable risk of causing side effects than modern antidepressants, such as selective serotonin reuptake inhibitors (SSRIs).

Below, we’ve explained how amitriptyline works, as well as the side effects you may experience if you’re prescribed this medication. 

We’ve also discussed amitriptyline drug interactions, potential safety risks and other issues you should be aware of before using amitriptyline to treat depression or any other condition. 

How Amitriptyline Works

Amitriptyline is a tricyclic antidepressant, or TCA. It’s an FDA-approved medication for treating major depressive disorder (MDD). It’s also used off-label to treat a variety of common medical conditions, such as chronic pain, anxiety, insomnia and irritable bowel syndrome.

Amitriptyline works by increasing levels of the neurotransmitters serotonin and norepinephrine, which are involved in regulating certain aspects of your moods, thoughts and feelings.

Low levels of these neurotransmitters are associatedwith depression, anxiety, a lack of energy and in some cases, suicidal thoughts and/or behavior. 

Experts theorize that by increasing the levels of these neurotransmitters in the brain and body, medications like amitriptyline can help to treat mood disorders such as depression.

Like other antidepressants, the effects of amitriptyline aren’t immediate. For most people, it can take two to four weeks before amitriptyline produces noticeable improvements in the symptoms of depression

Amitriptyline is one of many medications for treating depression. Our full list of antidepressants provides more information about how it and similar tricyclic antidepressants function. 

Common Side Effects of Amitriptyline

Like all antidepressants, amitriptyline can cause side effects. In fact, experts regard amitriptyline as having a considerable side effect profile — one reason it’s no longer widely used as a first-line treatment for depression.

Common side effects of amitriptyline include changes in body weight, dizziness, headaches, dry mouth, somnolence (drowsiness) and gastrointestinal issues. These may improve over time as your body adjusts to the effects of the medication. 

Changes in Body Weight

Changes in body weight, including weight gain, are common effects of tricyclic antidepressants such as amitriptyline. While using amitriptyline, you may develop a stronger appetite than usual and make changes in your eating habits, resulting in weight gain.

These effects may occur due to amitriptyline’s effects on histamine (H1) receptors. It’s best to talk to your healthcare provider if you notice a significant change in your appetite, eating habits and/or weight after starting treatment with amitriptyline.


Dizziness is a common side effect of amitriptyline. Feelings of dizziness and unsteadiness are known side effects of many antidepressants and are likely related to the effects of these drugs on your brain.

You may feel dizzy shortly after taking amitriptyline. If you have persistent or severe dizziness, it’s important to inform your healthcare provider.


Headaches are a frequently reported side effect of amitriptyline. Like dizziness, headaches are common with antidepressants and may occur as a result of the effects of this type of medication on your brain. Headaches related to amitriptyline use may improve over time.

Interestingly, amitriptyline and other antidepressants are occasionally prescribed off-label to stop migraine headaches. 

If you develop a headache after your dose of amitriptyline, try to rest and take in plenty of fluids to keep yourself hydrated. Over-the-counter pain relief drugs such as acetaminophen (Tylenol®) may help to provide relief.

Dry Mouth

Amitriptyline can cause xerostomia, or dry mouth. This is a common side effect of medications used in the treatment of depression. It’s caused by the effects of these drugs on the function of your salivary glands (the glands that produce saliva) and on your perception of oral dryness.

If you develop a dry mouth while using amitriptyline, try increasing your fluid intake, chewing on sugar-free gum or sucking sugar-free candy to stimulate saliva production. Limiting your intake of caffeine, alcohol and other substances that can dry out your mouth may also help.

If this side effect persists or is severe, talk to your healthcare provider. They may suggest using a saliva substitute lozenge, spray or gel to relieve your symptoms.

Somnolence (Drowsiness)

Somnolence, or sleepiness, is one of the most common side effects of amitriptyline. You may feel more tired than usual after taking amitriptyline and experience symptoms such as daytime sleepiness.

In fact, because of its sedative effects, amitriptyline is sometimes prescribed off-label as a sleep aid for people with insomnia or nighttime anxiety.

If you’re prescribed amitriptyline, do not drive a car or operate any machinery that could cause injury until you’re familiar with how this medication makes you feel.

Gastrointestinal Issues

Amitriptyline may cause or aggravate gastrointestinal health issues, such as nausea, vomiting and constipation. You may feel like you have an upset stomach after using your medication or eating a meal.

If you experience persistent nausea, vomiting or constipation after starting amitriptyline, talk to your healthcare provider before using any over-the-counter or prescription medications to treat these symptoms.

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Other Amitriptyline Side Effects

In addition to the common side effects listed above, amitriptyline may cause other side effects, including some that may require medical attention. Your risk of certain adverse effects may be higher if you have other medical conditions, including certain forms of mental illness. 

More severe adverse effects of amitriptyline include: 

  • Confusion and/or delirium

  • Orthostatic hypotension (low blood pressure after standing up)

  • Tachycardia (fast heart rate) or arrhythmia (irregular heartbeat)

  • Acute angle-closure glaucoma

  • Reduced seizure threshold

  • Hyperhidrosis (excessive sweating)

  • Decreased interest in sexual intercourse

  • Muscle spasms that affect your jaw, back and neck

  • Slowed speech and/or difficulty speaking

  • Increased risk of bone injuries

  • Numbness or weakness in your limbs

  • Severe chest pain

  • Urinary retention

  • Fainting

  • Seizures

Although uncommon, amitriptyline may induce mania in people with bipolar disorder or a family history of mental illnesses that involve manic symptoms.

Contact your healthcare provider as soon as you can if you experience any severe side effects from amitriptyline.

Amitriptyline Interactions and Safety Risks 

Amitriptyline is generally safe when used as directed. However, it can interact with several other widely used medications, including some used to treat depression and other mental illnesses. 

Like other antidepressants, amitriptyline can cause serotonin syndrome — a dangerous increase in serotonin levels — when used with other medications that increase serotonin levels. Serotonin syndrome is a potentially life-threatening syndrome caused by excessive serotonin levels. 

To prevent serotonin syndrome, amitriptyline should not be used with other medications that can increase serotonin levels, including other antidepressants and some medications for Parkinson's disease.

It’s especially important to take care when using amitriptyline if you’ve recently used monoamine oxidase inhibitors (MAOIs) — an older class of antidepressants that can cause interactions up to 14 days after their use is discontinued.

Amitriptyline should not be taken with medications that increase QTc (the interval between your heart contracting and relaxing). Many antiarrhythmic medications, antihistamines, beta-blockers, diuretics and other medications can affect your QT interval.

Amitriptyline should also not be used if you have an arrhythmia (heart rate or rhythm issue), any history of QTc prolongation, heart failure or have recently suffered a myocardial infarction (heart attack).

To avoid interactions and safety issues, make sure to inform your healthcare provider about any medications you currently use or have recently used, as well as your full medical history, before using amitriptyline. 

Sun Sensitivity

Amitriptyline may cause your skin to become more sensitive to sunlight. Try to limit the amount of time you spend in bright, direct sunlight while using amitriptyline. Wear protective clothing that covers your skin and apply SPF 30+, broad-spectrum sunscreen on sunny days.

Amitriptyline Withdrawal Effects

Like other antidepressants, amitriptyline should not be stopped abruptly. If you suddenly stop using Amitriptyline, you may experience withdrawal symptoms such as nausea, reduced levels of energy and nausea. 

These flu-like symptoms are referred to as antidepressant discontinuation syndrome. They can potentially occur with amitriptyline and other medicines for depression.

If you’re prescribed amitriptyline to treat depression, it’s important to continue using it after you start to feel better. Stopping treatment early may cause your depression to come back.

If you’d like to stop using amitriptyline, your healthcare provider will help you to gradually taper your dosage to reduce your risk of experiencing withdrawal symptoms.

Black Box Suicide Warning

Like other antidepressants, amitriptyline is associated with an increased risk of suicidal ideation and behavior in children, teenagers and adults under 25 years of age. As such, this medication carries a “black box” warning from the FDA.

If you’re under 25 years of age, using amitriptyline or other antidepressants may cause changes in your mental health and an increased risk of suicidality. Your mental health provider may ask to see you frequently for follow-up visits while you’re using this medication.

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Learn More About Treatments for Depression

Although amitriptyline isn’t commonly used as a first-line treatment for depression, your mental health provider may suggest using it if other medications aren’t fully effective at controlling your symptoms.

If you experience side effects from amitriptyline that are severe or persistent, it’s best to let your healthcare provider know. They may adjust your dosage of amitriptyline or suggest switching to a different medication. 

Interested in learning more about treating depression? Our guide to depression treatments goes into more detail about your options, from antidepressants to psychotherapy, lifestyle changes and more. 

If you’re feeling depressed and want to seek expert help right away, you can also connect with a licensed psychiatry provider from home using our online psychiatry service.

10 Sources

Hims & Hers has strict sourcing guidelines to ensure our content is accurate and current. We rely on peer-reviewed studies, academic research institutions, and medical associations. We strive to use primary sources and refrain from using tertiary references.

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This article is for informational purposes only and does not constitute medical advice. The information contained herein is not a substitute for and should never be relied upon for professional medical advice. Always talk to your doctor about the risks and benefits of any treatment.