It is important to share your medical history with your doctor before taking this medication, and you should not take it more than once daily. Side effects, such as headache, flu-like symptoms, stomach upset, runny or stuffy nose, and diarrhea may occur. If they persist or are severe, you should contact your doctor or pharmacist immediately. It is recommended that you do not take Vidalista black tablets with alcohol or grapefruit juice because these can interfere with the effectiveness of the medication.