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Antiflex Side Effects

Generic name: orphenadrine

Medically reviewed by Drugs.com. Last updated on Aug 19, 2024.

Note: This document provides detailed information about Antiflex Side Effects associated with orphenadrine. Some dosage forms listed on this page may not apply specifically to the brand name Antiflex.

Applies to orphenadrine: oral tablet extended release.

Other dosage forms:

Serious side effects of Antiflex

Along with its needed effects, orphenadrine (the active ingredient contained in Antiflex) 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 orphenadrine:

Rare

  • chest pain
  • chills
  • cough
  • fever
  • hallucinations (seeing, hearing, or feeling things that are not there)
  • headache
  • shortness of breath, troubled breathing, tightness in chest, and/or wheezing
  • skin rash, hives, itching, or redness
  • sores, ulcers, or white spots on lips or in mouth
  • swollen and/or painful glands
  • unusual bruising or bleeding
  • unusual tiredness or weakness

Incidence not known

  • abdominal or stomach pain
  • diarrhea
  • fainting
  • fast, pounding irregular heartbeat or pulse
  • glaucoma
  • joint or muscle pain
  • nausea
  • numbness or tingling of face, hands, or feet
  • redness and soreness of eyes
  • swelling of feet or lower legs
  • vomiting

Get emergency help immediately if any of the following symptoms of overdose occur while taking orphenadrine:

Symptoms of Overdose

Other side effects of Antiflex

Some side effects of orphenadrine 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

  • dizziness or lightheadedness
  • excitement, irritability, nervousness, or restlessness
  • headache
  • muscle weakness
  • unusually large pupils of eyes

Incidence not known

  • anxiety
  • deep or fast breathing with dizziness
  • itching skin
  • mental confusion
  • numbness of feet, hands and around mouth
  • trembling or shaking of hands or feet shakiness in legs, arms, hands, or feet

For healthcare professionals

Applies to orphenadrine: compounding powder, injectable solution, oral tablet extended release.

General

The more commonly reported adverse reactions are due to the anticholinergic effects of this drug; dry mouth is usually the first adverse effect to appear.

Hypersensitivity

Nervous system

Psychiatric

Ocular

Cardiovascular

Gastrointestinal

Genitourinary

Musculoskeletal

Dermatologic

Hematologic

References

1. (2001) "Product Information. Norflex (orphenadrine)." 3M Pharmaceuticals

Further information

Antiflex side effects can vary depending on the individual. 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.