Avana 100 mg (which contains Avanafil, a medication used to treat erectile dysfunction) because grapefruit can interfere with the way the body metabolizes Avanafil. This interaction may increase the risk of side effects and can affect the effectiveness of the medication. Here's why grapefruit should be avoided: Inhibition of Cytochrome P450 Enzyme: Grapefruit contains compounds, particularly furanocoumarins, that can inhibit the action of an enzyme called CYP3A4 in the liver. This enzyme is responsible for metabolizing many drugs, including Avanafil. When you consume grapefruit, it can reduce the breakdown of Avanafil, leading to higher levels of the drug in the bloodstream than intended. This can increase the risk of experiencing side effects. Increased Risk of Side Effects: Higher drug levels in the blood may lead to stronger effects of Avanafil, increasing the chances of side effects such as: Headaches Dizziness Flushing Low blood pressure Visual disturbances In some cases, this can cause more serious reactions, such as priapism (a prolonged erection), which requires medical intervention. Impact on Drug Effectiveness: By interfering with the metabolism of Avanafil, grapefruit can also alter the effectiveness of the medication. This could lead to either an increased risk of side effects or the medication not working as intended. General Advice: Avoid grapefruit and grapefruit juice for at least 24 to 48 hours before and after taking Avana 100 mg (Avanafil). Always check with your healthcare provider or pharmacist about potential food or drug interactions when starting a new medication.