Vidalista (which contains tadalafil) are relatively uncommon but can happen. Here’s why: Why vision changes occur with Vidalista: 1. Effect on PDE Enzymes Vidalista is a PDE5 inhibitor, mainly targeting the enzyme phosphodiesterase type 5 in the penis to increase blood flow. However, tadalafil can also weakly inhibit PDE6, an enzyme found in the retina (the light-sensitive layer at the back of the eye). PDE6 inhibition affects how the retina processes light, which can cause temporary visual disturbances like: Blurred vision Vidalista in color perception (e.g., seeing a blue tint) Increased sensitivity to light 2. Blood Flow and Eye Pressure Tadalafil affects blood vessels and blood flow, which might impact the eye’s circulation. In rare cases, it can cause changes in eye pressure or trigger problems like non-arteritic anterior ischemic optic neuropathy (NAION), a condition where blood flow to the optic nerve is reduced. How common are these vision changes? Vision side effects are rare and usually mild or temporary. If they occur, they typically resolve shortly after the medication wears off. What to do if you experience vision changes: Stop taking the medication immediately and contact your healthcare provider. Don’t ignore symptoms like sudden vision loss or significant changes—these require urgent medical attention. Summary: Vision changes with Vidalista happen because tadalafil can slightly affect enzymes and blood flow in the eye, but it’s uncommon. If you notice any changes in vision, get medical help right away.