Diphenhydramine

Diphenhydramine is an antihistaminic medication. It blocks the action of certain chemical messengers that are responsible for inflammation, congestion, itching, and other allergic reactions.

Dizziness, Drowsiness, Dryness in mouth, Blurred vision, Confusion, Convulsion, Difficulty in paying attention, Difficulty in urination, Fatigue, Headache, Hypersensitivity, Urinary retention, Muscle twitching, Palpitations, Sedation, Unsteadiness, Impaired coordination, Epigastric pain, Increased bronchial secretions, Dry mucous membrane, Constipation, Euphoria (feeling of intense excitement and happiness), Abnormality of voluntary movements, Discomfort when urinating, Hypotension (low blood pressure), Double vision, Diaphoresis, Erectile dysfunction, Early menstrual periods, Decreased appetite, Allergic sensitization, Photosensitivity, Eczematous eruptions, Agranulocytosis (deficiency of granulocytes in the blood), Paradoxical reactions, Depression, Sleep disturbance, Paresthesia (tingling or pricking sensation), Involuntary muscle movement, Tachycardia, Arrhythmia (irregular heartbeats)