10 Side Effects of Antihistamines
Reviewed: Dr. Mera
Side Effect #8: Issues with Vision
Some antihistamines such as diphenhydramine can cause patients to have blurry vision. These issues with vision are due to the inhibition of cholinergic nerves as some antihistamines are anticholinergics. The cholinergic nerves help the pupil to adjust, especially when looking at close images or objects.
Therefore, a possible side effect of antihistamines (that are anticholinergics) are vision issues. This also applies to allergy eye drops. Patients who experience persistent vision issues despite stopping the antihistamines should see a doctor.
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