There can be many possible side effects-- that is, unintended impacts-- to your eyes as a result of taking prescription medications. These side effects can show up either shortly after you start taking a drug or after prolonged use. The most common medications that can affect the eyes include antibiotics, antidepressants, antihistamines, appetite suppressants, blood pressure medications, hormone supplements, and steroids. Several heart and cancer drugs can also cause eye problems that you need to be aware of if you're taking these medications. If you're taking more than one medication, their interaction can also cause possible side effects that can affect your vision or cause damage to parts of your eye. In addition, you may be allergic to a medication prescribed by your eye doctor. Drugs can also affect your eyes in that some medications lose their effectiveness when used for a long period of time and your eyes develop a tolerance to them. Only by regular exams can it be determined whether you've become tolerant to your medication. It's important that prescription labels for eye drops or other eye medications be labeled properly, containing appropriate information regarding which eye is to be treated, for how long, proper dosage, frequency of usage, and expiration date. Drug reactions affecting your eyes are usually minor ones, such as blurring, swelling of the lid, or difficulty reading. More pronounced symptoms can include double vision or light sensitivity. In severe reactions, retinal hemorrhages, optic nerve damage, or glaucoma can result. Whenever you seek medical attention for symptoms affecting your eyes, it's important to discuss your medical history, including any medications you're taking or are allergic to.
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