It is very important that your doctor check your progress at regular visits to make sure this medicine is working properly and to check for unwanted effects.
Do not take sildenafil (Viagra®), tadalafil (Cialis®), or vardenafil (Levitra®) while you are using this medicine. Using these medicines together may cause blurred vision, dizziness, lightheadedness, low blood pressure, or fainting.
This medicine may cause headaches. The headaches are a sign that the medicine is working. Do not stop using the medicine or change how you use it to avoid the headaches. If you have questions about this, talk with your doctor.
Dizziness, lightheadedness, or fainting may occur, especially when you get up quickly from a lying or sitting position. Getting up slowly will help. You should also limit the amount of alcohol you drink to prevent more dizziness. If you have questions about this, talk with your doctor.
This medicine may make you dizzy or lightheaded. Avoid driving, using machines, or doing anything else that could be dangerous if you are dizzy.
Do not take other medicines unless they have been discussed with your doctor. This includes prescription or nonprescription (over-the-counter [OTC]) medicines and herbal or vitamin supplements.