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Pitolisant Side Effects

Medically reviewed by Last updated on Mar 6, 2024.

Applies to pitolisant: oral tablet.

Serious side effects of Pitolisant

Along with its needed effects, pitolisant may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking pitolisant:

Incidence not known

Other side effects of Pitolisant

Some side effects of pitolisant may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

Less common

Incidence not known

For Healthcare Professionals

Applies to pitolisant: oral tablet.


The more commonly reported adverse reactions have included insomnia, nausea, and anxiety.[Ref]


Common (1% to 10%): Insomnia, anxiety, irritability, depression, sleep disturbance, hallucinations, cataplexy

Uncommon (0.1% to 1%): Agitation, affect lability, abnormal dreams, dyssomnia, middle insomnia, initial insomnia, terminal insomnia, nervousness, tension, apathy, nightmare, restlessness, panic attack, decreased libido, increased libido

Rare (less than 0.1%): Abnormal behavior, confusional state, depressed mood, excitability, obsessive thoughts, dysphoria, hypnopompic hallucination, depressive symptom, hypnagogic hallucination, mental

Postmarketing reports: Abnormal behavior, abnormal dreams, anhedonia, bipolar disorder, depression, depressed mood, nightmare, sleep disorder, suicide attempt, suicidal ideation[Ref]

Nervous system

Common (1% to 10%): Headache, dizziness, tremor, vertigo

Uncommon (0.1% to 1%): Dyskinesia, balance disorder, cataplexy, disturbance in attention, dystonia, on and off phenomenon, migraine, psychomotor hyperactivity, restless legs syndrome, somnolence, epilepsy, bradykinesia, paraesthesia, tinnitus

Rare (less than 0.1%): Loss of consciousness, tension headache

Postmarketing reports: Epilepsy[Ref]


Common (1% to 10%): Nausea, vomiting, dyspepsia, abdominal pain, dry mouth

Uncommon (0.1% to 1%): Diarrhea, abdominal discomfort, upper abdominal pain, constipation, gastroesophageal reflux disease, gastritis, gastrointestinal pain, hyperacidity, oral paraesthesia, stomach discomfort

Rare (less than 0.1%): Abdominal distention, dysphagia, flatulence, odynophagia, enterocolitis[Ref]


Common (1% to 10%): Fatigue

Uncommon (0.1% to 1%): Asthenia, chest pain, metrorrhagia, feeling abnormal, malaise, edema, peripheral edema

Rare (less than 0.1%): Pain, spontaneous abortion, sense of oppression, abnormal general physical condition[Ref]


Common (1% to 10%): Increased heart rate (heart rate increased; sinus tachycardia; tachycardia)

Uncommon (0.1% to 1%): Extrasystoles, bradycardia, hypertension, hypotension, hot flush, QTc prolongation

Rare (less than 0.1%): ECG repolarization abnormality, ECG T-wave inversion[Ref]

At a dose of 35.6 mg/day, QTc increases of 4.2 msec were observed. With exposures 3.8-fold higher a mean QTc increase of 16 msec was observed.[Ref]


Common (1% to 10%): Rash (eczema, erythema migrans, rash, urticaria)

Uncommon (0.1% to 1%): Sweating, erythema, pruritus, hyperhidrosis

Rare (less than 0.1%): Toxic skin eruption, photosensitivity, night sweats[Ref]


Uncommon (0.1% to 1%): Pollakiuria[Ref]


Uncommon (0.1% to 1%): Increased hepatic enzymes, increased GGT[Ref]


Uncommon (0.1% to 1%): Decreased appetite, increased appetite, fluid retention, increased weight, decreased weight

Rare (less than 0.1%): Anorexia, hyperphagia, appetite disorder[Ref]


Common (1% to 10%): Musculoskeletal pain ( arthralgia; back pain; carpal tunnel syndrome; limb discomfort; musculoskeletal pain; myalgia; neck pain; osteoarthritis; pain in extremity; sciatica)

Uncommon (0.1% to 1%): Arthralgia, back pain, muscle rigidity, muscular weakness, musculoskeletal pain, myalgia, pain in extremity,

Rare (less than 0.1%): Neck pain, musculoskeletal chest pain, increased creatine phosphokinase[Ref]


Uncommon (0.1% to 1%): Reduced visual acuity, blepharospasm[Ref]


Common (1% to 10%): Upper respiratory tract infection (pharyngitis; rhinitis; sinusitis; upper respiratory tract infection; upper respiratory tract inflammation; viral upper respiratory tract infection)

Uncommon (0.1% to 1%): Yawning[Ref]

Frequently asked questions


1. Svendsen UG, Ibsen H, Rasmussen S, Leth A, Nielsen MD, Dige-Petersen H, Giese J. Effects of combined therapy with amiloride and hydrochlorothiazide on plasma and total body potassium, blood pressure, and the renin- angiotensin-aldosterone system in hypertensive patients. Eur J Clin Pharmacol. 1986;30:151-6.

2. Cerner Multum, Inc. UK Summary of Product Characteristics.

3. Product Information. Wakix (pitolisant). Harmony Biosciences, LLC. 2019.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.