Viagra, containing sildenafil, can cause temporary vision changes in some users. This is because sildenafil affects the phosphodiesterase-5 (PDE5) enzyme, found not only in the penis but also in the retina. Blocking PDE5 can increase blood flow to the retina, potentially leading to side effects.
Types of Vision Problems
The most common side effects are mild and temporary, including changes in color perception (objects may appear with a bluish tinge), blurred vision, and increased light sensitivity. Rarely, more serious issues like non-arteritic anterior ischemic optic neuropathy (NAION), a sudden loss of vision, can occur. This is more likely in individuals with pre-existing risk factors for NAION, such as high blood pressure or diabetes.
Risk Factors and Precautions
Men with pre-existing eye conditions should discuss the risks with their doctor before taking sildenafil. Those experiencing any sudden vision changes while using Viagra should stop immediately and seek medical attention. The risk of vision problems is generally considered low, but awareness of potential side effects is crucial for informed decision-making.
Severity and Duration
| Blurred vision | Common | Temporary, usually resolves within hours |
| Color vision changes | Common | Temporary, usually resolves within hours |
| Increased light sensitivity | Common | Temporary, usually resolves within hours |
| NAION | Rare | Can be permanent |
Seeking Medical Advice
This information is for educational purposes only and does not constitute medical advice. Always consult your physician or ophthalmologist before starting any new medication, particularly if you have a history of eye problems or are taking other medications.
