- The most common reactions to allergy medications include dizziness, drowsiness and constipation. These symptoms may subside as one's body becomes used to the medication.
- Dry mouth, another side effect of allergy medication, can be remedied by sucking on candy or ice chips, chewing gum or staying hydrated by drinking water.
- Notify your doctor immediately if you experience irregular heartbeat, difficulty urinating, seizures or ringing in the ears.
- An allergic reaction to allergy medication can include a rash, trouble breathing, itching, swelling or dizziness. Contact your doctor immediately if any of these occurs.
- Certain medications, such as Parkinson's drugs,have a bad reaction with allergy medications. Make sure your doctor knows about all medicine you are taking, and if purchasing allergy medication over-the-counter, be sure to read the label for potential bad interactions.