Which elderly medications cause diplopia?

✓ Accepted answer

Several medication classes commonly prescribed to older adults are linked to diplopia, primarily by affecting eye muscle alignment or neurological signaling.

• Anticholinergic Agents: Drugs such as diphenhydramine and certain antidepressants can blur vision and disrupt accommodation, potentially contributing to double images, especially in those with pre-existing eye strain.
• Antiepileptics: Medications like phenytoin and carbamazepine are known to cause nystagmus and ocular misalignment, which can result in temporary or chronic diplopia as a side effect.
• Opioids: Strong pain relievers like morphine and oxycodone can dilate pupils and alter visual focus, sometimes leading to transient double vision during dose adjustments.
• Immunotherapies: Oncology treatments, including checkpoint inhibitors such as pembrolizumab, can trigger neurological side effects that occasionally manifest as ocular motor nerve palsies.
• Safety Protocol: If a senior experiences new-onset double vision, they should immediately stop driving or operating machinery. They must document the specific medication and time of onset to share with their physician.
• Medical Evaluation: A referral to an ophthalmologist or neurologist is critical to distinguish drug-induced side effects from serious conditions like stroke, myasthenia gravis, or diabetic retinopathy, which are also common in the elderly.

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