Generic Cialis (Tadalafil) is an oral drug used for the treatment of erectile dysfunction (impotence). It functions by allowing an increased blood flow to the penis, which makes it easier to attain and sustain erection during sexual stimulation. 

Cialis is approved for the treatment of men who have difficulty having and maintaining an erection, otherwise known as impotence. If the nerves or blood vessels associated with this process aren't working properly, a man may not be able to get an erection. Cialis increases blood flow to the penis, so that when a man is sexually aroused, he can get and keep an erection.

Direction

Take this medicine by mouth as needed before sexual activity as directed by your doctor. Do not take this medicine more often than once daily. If you are taking certain other medicines you may only be able to take this medicine one time every two or three days. Contact your doctor or pharmacist for more information. This medicine may be taken on an empty stomach or with food.

Store this medicine at room temperature, away from heat and light.

Cautions

Do not take this medicine if you have had an allergic reaction to it or are allergic to any ingredient in this product. This medicine may rarely cause dizziness or vision changes. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to this medicine. Using this medicine alone, with other medicines, or with alcohol may lessen your ability to drive or to perform other potentially dangerous tasks. To minimize dizziness or lightheadness, sit up or stand slowly when rising from a seated or lying position. Alcohol may increase your risk for side effects, including headache, dizziness, or lightheadedness. Avoid excessive amounts of alcohol when using this medicine.

Do not exceed the recommended doze without checking with your doctor. Your dose is based on your medical condition, response to therapy, and the other medicines you are taking.

Sexual activity may put extra strain on your heart, especially if you have heart problems. If you have heart problems and experience any symptoms while having sex, stop having sex and tell your doctor immediately. These symptoms include severe dizziness, fainting, chest pain, or nausea.

Caution is advised when using this medicine in the elderly because they may be more sensitive to the side effects of this medicine. This medicine should not be used in women or children.

Side Effects

Side effects that may occur while taking this medicine include headache, flushing, stomach upset or nausea, heartburn, stuffy or runny nose, back pain, muscle pain, or vision changes such as trouble telling the difference between blue and green or seeing a blue tinge to objects. If  these continue or are bothersome, check with your doctor.

In the unlikely event that you have a painful or prolonged erection (lasting more than 4 hours), stop using this medicine and seek immediate medical attention or permanent problems may occur.

An allergic reaction to this medicine is unlikely but seek immediate medical attention if it occurs. Symptoms of an allergic reaction include rash, itching, unusual swelling, severe dizziness, or trouble breathing.

Overdose

If overdose is suspected, contact your local poison control center or emergency room immediately. Symptoms of overdose may include back pain, muscle pain, and abnormal vision.

Additional Information

If your symptoms do not improve or if they become worse, check with your doctor. Do nit share this medicine with others for whom it was not prescribed, since they may have a problem that is not effectively treated with this medicine, or they may have a condition that is complicated by this medicine. Do not use this medicine for other health conditions. Keep this medicine out of the reach of children.