Femalegra 100 mg contains Sildenafil Citrate 100 mg, the same active ingredient found in Viagra. It's primarily used to improve ***** arousal in women by increasing blood flow to the genital area. While it's not FDA-approved for women, it is used off-label in certain cases, such as female ***** arousal disorder (FSAD) or female ***** interest/arousal disorder (FSIAD). Because Sildenafil is a PDE-5 inhibitor, it can interact with PDE-6 enzymes found in the retina, especially at higher doses like 100 mg. This may lead to temporary visual side effects, including: Blue-tinted vision (cyanopsia) Increased sensitivity to light Difficulty distinguishing between blue and green These effects typically appear within 1 to 2 hours after taking the drug and resolve within a few hours. In rare cases, Sildenafil has been linked to NAION (Non-Arteritic Anterior Ischemic Optic Neuropathy), a condition that causes sudden vision loss, usually in one eye. Risk factors include: If you experience blurred vision or color changes, do not drive or operate heavy machinery. If you have any history of eye disease, especially retinal disorders (e.g., retinitis pigmentosa), talk to your doctor before using Femalegra. If you experience sudden vision loss, stop taking it immediately and seek emergency medical care.