Filitra 20 mg contains Vardenafil, a PDE5 inhibitor used to treat erectile dysfunction (ED). Like all ED medications, it can cause side effects, and timing depends on when and how it is taken. Here’s a detailed explanation: When Side Effects Can Occur After Taking the Tablet (Onset of Action) Filitra 20 mg usually starts working 30–60 minutes after ingestion. Most side effects appear within this window, when the medication reaches peak blood levels. During ***** Activity Because Filitra enhances blood flow, side effects like flushing, dizziness, or rapid heartbeat may occur during ***** stimulation. Rarely, prolonged erections (priapism) or vision changes can appear during *****. With Food or Alcohol Taking Filitra after a high-fat meal can delay absorption, sometimes leading to stronger or more prolonged effects once it kicks in, which may increase side effects. Excessive alcohol can intensify side effects such as dizziness, low blood pressure, or headache. Interactions with Other Medications Nitrates or certain blood pressure medications combined with Filitra can cause dangerously low blood pressure, potentially leading to fainting or heart complications. Other PDE5 inhibitors or recreational drugs can also increase side effects. Common Side Effects Headache Flushing (redness of face/neck) Dizziness Nasal congestion Upset stomach or indigestion Rare but Serious Side Effects Prolonged erection (>4 hours) — priapism Sudden vision or hearing changes Severe dizziness or fainting Summary Filitra 20 mg side effects usually appear within 30–60 minutes after taking the pill, around the time it starts working, or during ***** activity. Their intensity can be influenced by food, alcohol, other medications, or individual sensitivity. Most side effects are mild and temporary, but serious reactions require immediate medical attention.