Benadryl contains diphenhydramine, an antihistamine. This medication works by blocking the effects of histamine, a substance your body releases during allergic reactions. This action helps relieve allergy symptoms like sneezing, itching, and runny nose.
Common Side Effects
While generally safe, diphenhydramine can cause side effects. These commonly include drowsiness, dry mouth, blurred vision, and constipation. Less frequent but still possible side effects are dizziness, urinary retention, and increased heart rate. Children may be more susceptible to these effects. Always follow the recommended dosage carefully, especially for children. If you notice any unusual or severe side effects, contact your doctor immediately.
Serious Side Effects: When to Seek Immediate Medical Attention
Rarely, Benadryl can cause more serious side effects requiring prompt medical attention. These include difficulty breathing, swelling of the face, lips, or tongue (signs of a severe allergic reaction), seizures, and irregular heartbeat. If you experience any of these symptoms, seek immediate medical help.
