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Side Effects of Cyclobenzaprine

Common Side Effects

Cyclobenzaprine has been studied thoroughly in clinical trials. In these studies, the side effects that occur in a group of people taking the drug are documented and then compared to the side effects that occur in another group of people not taking the medicine. As a result, it is possible to see what side effects occur, how often they appear, and how they compare to the group not taking the medicine.
In these studies, the most common cyclobenzaprine side effects included:
  • Drowsiness -- in up to 39 percent of people
  • Dry mouth -- up to 32 percent (see Flexeril and Dry Mouth)
  • Dizziness -- up to 11 percent.
Some other common side effects (occurring in 1 to 3 percent of people) included:
  • Fatigue or tiredness
  • Weakness
  • Nausea
  • Constipation
  • Indigestion or heartburn
  • Unpleasant taste
  • Blurred vision
  • Nervousness
  • Confusion.

Rare Side Effects of Cyclobenzaprine

There are other, less common cyclobenzaprine side effects that can occur. These side effects occur in less than 1 percent of people taking cyclobenzaprine. For these side effects, it is difficult to tell whether the medicine or something else causes the side effect.
These less common side effects include, but are not limited to:
  • A general ill feeling (malaise)
  • Flushing or hot flashes
  • Loss of appetite
  • Diarrhea
  • Thirst
  • Gas
  • Coordination problems
  • A spinning sensation (vertigo)
  • Shakiness (tremors)
  • Insomnia (see Flexeril and Insomnia)
  • Double vision
  • Increased sweating
  • Loss of taste
  • Ringing in the ears (tinnitus).
Alternative Therapies for Pain Management

Cyclobenzaprine Hydrochloride (HCl) Information

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