Flexeril (Cyclobenzaprine) Detailed Information

The active ingredient in Flexeril is Cyclobenzaprine hydrochloride. Inactive ingredients may include starch, lactose, and magnesium stearate.

Common side effects of Flexeril include:

• Drowsiness
• Dry mouth
• Dizziness
• Fatigue
• Constipation

Serious side effects may include:

• Irregular heartbeat
• Severe dizziness or fainting
• Confusion or hallucinations
• Allergic reactions such as swelling or rash

Seek medical attention if severe side effects occur.

Flexeril is typically taken orally, with or without food, up to three times a day. It is usually prescribed for short-term use (two to three weeks) as part of a comprehensive treatment plan that includes physical therapy and rest.

Flexeril may interact with other medications, including:

• MAO inhibitors (e.g., phenelzine, selegiline)
• Antidepressants (e.g., SSRIs, TCAs)
• Opioid pain relievers
• Alcohol or other CNS depressants

Consult your doctor before combining Flexeril with other medications.

Flexeril typically starts working within an hour, with peak effects occurring within a few hours. Relief may last for 12 to 24 hours, depending on the formulation.

Seek medical attention if you experience severe dizziness, difficulty breathing, irregular heartbeat, or signs of overdose such as extreme drowsiness and confusion.