Lofexidine Side Effects
Medically reviewed by Drugs.com. Last updated on March 25, 2020.
For the Consumer
Applies to lofexidine: oral tablet
Side effects requiring immediate medical attention
Along with its needed effects, lofexidine 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 lofexidine:
- Chest pain or discomfort
- cold sweats
- dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
- slow or irregular heartbeat
- unusual tiredness
Side effects not requiring immediate medical attention
Some side effects of lofexidine 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:
- dry mouth
- relaxed and calm feeling
- trouble sleeping
- unusual drowsiness
- Continuing ringing or buzzing or other unexplained noise in the ears
- hearing loss
Incidence not known
For Healthcare Professionals
Applies to lofexidine: oral tablet
Adverse reactions are reported at mean average daily doses up to 2.88 mg/day. With a mean dose of 2.16 mg/day, insomnia, orthostatic hypotension, bradycardia, and hypotension, were reported at 51%, 29%, 24%, and 30%, respectively. Syncope was reported in 0.9% of patients receiving 2.16 mg/day (1.4% for patients receiving 2.88 mg/day and 0% for placebo).
Blood pressure (BP) elevations of 140 mmHg (systolic) or higher, and above the subject's pretreatment BP, occurred in 39.7% (n= 23/58) of patients following discontinuation of a 5-day course of 2.88 mg/day. BP peaked on the second day after discontinuation.
Since market introduction (1992 in UK), there has been 1 case of QT prolongation, bradycardia, torsades de pointes, and cardiac arrest with successful resuscitation; there have been 3 reports of clinically significant QT prolongation in patients concomitantly receiving methadone.
Cardiac electrophysiology studies with single doses of 1.44 to 1.8 mg produced maximum mean change from baseline QTcF of 14.4 and 13.6 milliseconds, respectively in healthy normal volunteers. In a phase 3 study in opioid-dependent subjects, a maximal mean prolongation of the QTcF interval of 7.3 and 9.3 milliseconds occurred at doses of 2.16 and 2.88 mg/day respectively. In patients with renal or hepatic impairment, QT prolongation was reported; it was more pronounced in subjects with severe renal or hepatic impairment.
Very common (10% or more): Orthostatic hypotension (up to 42%); bradycardia (up to 32%); hypotension (30%), hypertension with abrupt discontinuation
Uncommon (0.1% to 1%): Syncope
Postmarketing reports: QT prolongation
Very common (10% or more): Dizziness (up to 23%), somnolence (up to 13%), sedation (up to 13%)
Very common (10% or more): Dry mouth (up to 11%)
Uncommon (0.1% to 1%): Tinnitus
Insomnia was reported in 51% of patients receiving a mean average daily dose of 2.16 mg/day and 55% of those receiving 2.88 mg/day; however, it was also reported by 48% of those receiving placebo.
For patients stopping this drug, a higher incidence of diarrhea, insomnia, anxiety, chills, hyperhidrosis, and extremity pain occurred in drug-treated patients compared to those taking placebo.
Very common (10% or more): Insomnia (up to 55%)
Frequency not reported: Withdrawal symptoms
1. "Product Information. Lucemyra (lofexidine)." US WorldMeds LLC, Louisville , KY.
Frequently asked questions
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- Drug class: antiadrenergic agents, centrally acting
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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.