Fliban 100 mg can cause back pain as a possible side effect, although not everyone experiences it. Here’s why and how it happens: Active ingredient: Fliban 100 mg contains Flibanserin, but if you are referring to ED medications like Sildenafil or Tadalafil, sometimes products branded as “Fliban” contain PDE5 inhibitors. For PDE5 inhibitors (like Tadalafil), muscle and back pain are a known side effect. Mechanism: PDE5 inhibitors increase blood flow by relaxing smooth muscles in blood vessels. This relaxation can also affect muscles in the lower back or spine, sometimes causing mild to moderate aches. The effect is usually temporary and resolves within 24–48 hours. Risk factors: Higher doses (like 100 mg) increase the likelihood of side effects. Pre-existing back problems or strenuous physical activity may make pain more noticeable. Management: Over-the-counter pain relievers (like acetaminophen or ibuprofen) can help. Ensure proper hydration and avoid heavy physical strain soon after taking the medication. If back pain is severe, persistent, or accompanied by other symptoms (like vision changes or chest pain), seek medical attention immediately.