Benadryl is a popular anti-allergy medication. It is sold in multiple forms. Some are intended for oral administration, others are applied on the skin. This is an over-the-counter drug, but stronger versions are received via a prescription.
The given infographic includes common Benadryl adverse effects. To stay on the safe side, use the lowest dose that gives the needed effect. Exceeding the dosage can lead to severe side effects and overdose. Call for emergency help if any of these symptoms occur: agitation, hallucinations, fast or irregular heartbeat, dizziness, flushing, tremor, muscle rigidity, nausea, vomiting, or diarrhea.