Some patients notice mild changes in vision after taking ED medication. These effects are temporary and typically resolve within a few hours.
Why It Happens
Certain ED medications can mildly affect an enzyme in the retina (PDE6), which is involved in processing light and colour. This can cause:
A blue tint or hue in your vision
Increased sensitivity to light
Blurred vision in low-light settings
These are more common with higher doses or in medications that act longer in the body.
What It Feels Like
Colours (especially blues) may appear altered or brighter
Sensitivity to light (e.g. sunlight, screens)
Difficulty adjusting to dark environments
Rarely, blurry vision or visual “halo” effects
How to Manage
Reduce screen time during peak medication effect
Use sunglasses if outdoors or in bright light
Lower your dose (if cleared by your doctor)
Avoid driving at night or in poor visibility if symptoms are present
When to Speak With Your Doctor
If visual symptoms are severe or persistent
If they interfere with work, driving, or daily tasks
If you experience sudden vision loss (seek emergency care)
Blue-tinged vision and light sensitivity are known but uncommon effects of ED medications. They are dose-dependent and short-lived. If visual symptoms are bothersome or don’t resolve within 12 hours, speak to your doctor about adjusting your treatment.