Cenforce can cause dizziness within about 30 minutes to 2 hours after taking it, although the timing varies from person to person. Cenforce contains sildenafil, the same active ingredient used in Viagra and Fildena. Dizziness can happen because sildenafil widens blood vessels and may temporarily lower blood pressure. It may be more noticeable: When standing up quickly from sitting or lying down. In the first few hours after taking a dose. If you drink alcohol, are dehydrated, or take medicines that lower blood pressure. If you take it with certain medicines, particularly nitrates or some alpha-blockers. What to do if you feel dizzy Sit or lie down until the dizziness passes, then stand up slowly. Avoid alcohol and driving while dizzy. Don't take another dose until you've spoken with a healthcare professional if you experience a significant reaction. Seek urgent medical help if you faint, have chest pain, difficulty breathing, sudden vision or hearing loss, or severe/persistent dizziness. If you develop chest pain after sildenafil, do not take nitrate medication such as nitroglycerin yourself.