Allergy Drug Side Effects

Generally, if allergy medications are taken at their recommended dosages, will have few, if any, side effects.

Antihistamine Side Effects

Drowsiness and headache are the more common side effects from some antihistamine medications, both over the counter and prescription. However, drowsiness or a slightly sedated feeling may sometimes be desirable, for example at nighttime when allergies could potentially prevent restful sleep.

Less Common side effects include dizziness, dry mouth, nausea, fatigue, and sleepiness.

Rare side effects include rash, hives, anaphylaxis, and shortness of breath.

Other side effects are also possible. If you notice any other effects, please check with your physician or healthcare professional.

Leukotriene modifier side effects

Side effects from leukotriene modifiers include cough, dizziness, headache, stomach upset or pain, stuffy nose, tiredness, or muscle weakness.

Nasal Spray Side Effects

There are some mild nasal spray side effects which may include an unpleasant smell or bitter taste, sneezing, nasal burning or bleeding, runny nose or sore throat, dry mouth, dizziness, drowsiness or fatigue, headache, irritation (especially in the winter), crusting and nose bleeds (especially in the winter).

Eye Drop Side Effects

The side effects of some eye drops may cause burning and stinging when you first apply them, but this usually goes away in a few minutes. Blurred vision and other mild side effects are also possible. Additionally, you may have an increased risk of eye infections, glaucoma and cataracts with prolonged use of eye drops.