Fildena, like many medications, has a shelf life that can be affected by exposure to air, light, and humidity once the packaging is opened. Typically, Fildena (which contains sildenafil, similar to Viagra) should maintain its effectiveness for 1 to 2 years after the bottle or blister pack is opened, as long as it’s stored properly. To ensure the medication stays effective, follow these storage guidelines: Store in a cool, dry place  Fildena. Keep the medication in its original packaging to protect it from moisture and light. Avoid storing in the bathroom due to the high humidity levels. Keep the medication out of reach of children. If you notice any changes in appearance (e.g., discoloration or unusual smell), or if the medication is well past its expiration date, it’s best to discard it. If you're unsure about the specific expiration or potency of your medication, it’s a good idea to consult your pharmacist.