Note: This document contains side effect information about cyclobenzaprine. Some of the dosage forms listed on this page may not apply to the brand name Fexmid.
Applies to cyclobenzaprine: oral capsule extended release, oral suspension, oral tablet
Along with its needed effects, cyclobenzaprine (the active ingredient contained in Fexmid) 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 cyclobenzaprine:
Get emergency help immediately if any of the following symptoms of overdose occur while taking cyclobenzaprine:
Symptoms of overdose
Some side effects of cyclobenzaprine 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:
Less common or rare
Applies to cyclobenzaprine: compounding powder, oral capsule extended release, oral tablet, oral and topical kit
The most frequently occurring adverse reactions have included dry mouth, dizziness, fatigue, constipation, nausea, dyspepsia, and somnolence.
Very common (10% or more): Drowsiness (up to 38%)
Common (1% to 10%): Dizziness, somnolence
Postmarketing reports: Headache, serotonin syndrome, seizures, ataxia, tremors, hypertonia, convulsions, abnormal sensations, paresthesia, ageusia
Elderly patients may be particularly susceptible to the sedation and confusion which may accompany cyclobenzaprine therapy.
Common (1% to 10%): Irritability, mental acuity decreased, nervousness
Postmarketing reports: Nervousness, confusion, disorientation, insomnia, depressed mood, anxiety, agitation, psychosis, abnormal thinking and dreaming, hallucinations, excitement
Postmarketing reports: Anaphylaxis, angioedema, pruritus, facial edema, urticaria, rash
Very common (10% or more): Dry mouth (up to 32%)
Common (1% to 10%): Constipation, nausea, dyspepsia, abdominal pain, acid regurgitation, diarrhea
Postmarketing reports: Unpleasant taste, vomiting, anorexia, gastritis, thirst, flatulence, tongue edema
Postmarketing reports: Abnormal liver function, hepatitis, jaundice, cholestasis
Postmarketing reports: Syncope, tachycardia, arrhythmia, vasodilation, palpitation, hypotension
Common (1% to 10%): Fatigue
Postmarketing reports: Asthenia, malaise, vertigo
Postmarketing reports: Sweating
Postmarketing reports: Urinary frequency and/or retention
Postmarketing reports: Local weakness, dysarthria, muscle twitching
Postmarketing reports: Blurred vision, diplopia, tinnitus
Common (1% to 10%): Upper respiratory infection, pharyngitis
Medically reviewed by USARx EDITORIAL TEAM Last updated on 1/1/2020.
Source: Drugs.com Fexmid (www.drugs.com/mtm/fexmid.html).
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