Antihistamines, Phenothiazine-derivative (Systemic)

Side Effects of This Medicine

Along with its needed effects, a medicine 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 as soon as possible if any of the following side effects occur:

Less common or rare

Sore throat and fever; unusual bleeding or bruising; unusual tiredness or weakness

Symptoms of overdose

Clumsiness or unsteadiness; convulsions (seizures); drowsiness (severe); dryness of mouth, nose, or throat (severe); feeling faint; flushing or redness of face; hallucinations (seeing, hearing, or feeling things that are not there); muscle spasms (especially of neck and back); restlessness; shortness of breath or troubled breathing; shuffling walk; tic-like (jerky) movements of head and face; trembling and shaking of hands; trouble in sleeping

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your health care professional if any of the following side effects continue or are bothersome:

More common

Drowsiness (less common with methdilazine); thickening of mucus

Less common or rare

Blurred vision or any change in vision; burning or stinging of rectum (with rectal suppository); confusion; difficult or painful urination; dizziness; dryness of mouth, nose, or throat; fast heartbeat; feeling faint; increased sensitivity of skin to sun; increased sweating; loss of appetite; nightmares; ringing or buzzing in ears; skin rash; unusual excitement, nervousness, restlessness, or irritability

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your health care professional.