Temporary vision changes, such as changes in color vision or blurred vision, can occur as side effects of medications containing sildenafil citrate, including Fildena 120 mg. Sildenafil citrate is the active ingredient in Fildena 120mg and belongs to a class of medications known as phosphodiesterase type 5 (PDE5) inhibitors.

Here's why temporary vision changes may occur with Fildena 120 mg:

1. Effects on PDE5: Sildenafil citrate works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which regulates blood flow in the penis. While its primary mechanism of action is to improve blood flow to the penis and treat erectile dysfunction, sildenafil citrate can also affect other parts of the body, including the eyes.

2. Vasodilation: Sildenafil citrate can cause vasodilation (widening of blood vessels) throughout the body, including in the ocular blood vessels. Changes in blood flow to the retina and other parts of the eye may lead to temporary alterations in vision.

3. Effects on retinal function: Some studies suggest that sildenafil citrate may have direct effects on retinal function, potentially affecting the way the retina processes light and color. These effects may manifest as changes in color vision or perception.

4. Transient nature: In most cases, vision changes associated with sildenafil citrate are transient and resolve spontaneously within a few hours. They typically occur shortly after taking the medication and may coincide with peak plasma concentrations of sildenafil citrate in the bloodstream.

5. Individual variability: Not everyone who takes sildenafil citrate will experience vision changes, and the severity and duration of these changes can vary among individuals. Some people may be more sensitive to the effects of the medication than others.

It's important to note that while temporary vision changes are a potential side effect of sildenafil citrate, they are generally mild and reversible. Serious vision problems associated with sildenafil citrate, such as sudden vision loss or non-arteritic anterior ischemic optic neuropathy (NAION), are rare but possible and require immediate medical attention.

If you experience any sudden or severe vision changes while taking Fildena 120 mg or any medication containing sildenafil citrate, it's important to stop taking the medication and seek prompt medical attention. Your healthcare provider can evaluate your symptoms and determine the appropriate course of action.