Many of my patients suffer from environmental allergies all year long and are used to using an antihistamine eye drop to relieve the symptoms. At the time of eye surgery, whether LASIK or Cataracts, I tell them two things. One, that the post op eye drop regimen we have them use for about two weeks will make those allergy symptoms much less problematic. The reason is that one drop contains a steroid and, as we all know, we all feel better on just a little bit of steroids. We will taper you off of that steroid drop pretty quickly, as steroids can also cause some side effects. While on the steroid, the symptoms of allergy are rarely noticed. The second thing I tell my Lasik and Cataracts patients is that using an antihistamine eye drop can also cause some mild dry eye, which is also one of the short term side effects of eye surgery. So, resumption of the allergy eye drops should be postponed until about 7-10 days after surgery. Use of these drops, daily, has shown no long term side effects, so, after your brief hiatus to have eye surgery, it is fine to resume them.