Which medications used for erectile dysfunction can cause cyanopsia (blue-tinted vision) and photosensitivity?

• A. Viagra & Levitra
• B. Ritalin, Dexedrine (ADHD)
• C. Pioglitazone (Actos)
• D. Benadryl (diphenhydramine)

Answer: (A)

Cyanopsia and photosensitivity arise from how certain erectile dysfunction meds affect the retina. Sildenafil (Viagra) and vardenafil (Levitra) are PDE5 inhibitors that also substantially inhibit PDE6 in the retina. PDE6 is part of the phototransduction pathway in rods and cones, so when it’s inhibited, color processing shifts toward blue and light sensitivity increases. That blue-tinted vision, sometimes with more sensitivity to light, is a well-known ocular side effect of these drugs.

Other listed medications don’t share this retinal effect. Stimulants for ADHD, a diabetes medication, and an antihistamine don’t produce the characteristic blue-vision change or marked photosensitivity seen with these PDE5 inhibitors. So the best choice is the pair that includes sildenafil and vardenafil.