Instructions

This medicine may be taken with or without food.

This medicine will work best if you take it at about the same time every day.

Store at room temperature away from heat, light, and moisture. Do not keep in the bathroom.

It is important that you keep taking each dose of this medicine on time even if you are feeling well.

If you forget to take a dose on time, take it as soon as you remember. If it is almost time for the next dose, do not take the missed dose. Return to your normal schedule. Do not take 2 doses at one time.

Drug interactions can change how medicines work or increase risk for side effects. Tell your health care providers about all medicines taken. Include prescription and over-the-counter medicines, vitamins, and herbal medicines. Speak with your doctor or pharmacist before starting or stopping any medicine.

Tell your doctor if symptoms do not get better or if they get worse.

Keep all appointments for medical exams and tests while on this medicine.

Cautions

Tell your doctor and pharmacist if you ever had an allergic reaction to a medicine.

Do not use the medication any more than instructed.

This medicine may cause dizziness or fainting. Do not stand or sit up quickly.

Your ability to stay alert or to react quickly may be impaired by this medicine. Do not drive or operate machinery until you know how this medicine will affect you.

Please check with your doctor before drinking alcohol while on this medicine.

Do not take any medicine containing nitrates while on this medicine.

It is unknown if this medicine passes into breast milk. Ask your doctor before breastfeeding.

During pregnancy, this medicine should be used only when clearly needed. Talk to your doctor about the risks and benefits.

If you have a painful erection or an erection for more than 4 hours, seek medical care right away.

Call your doctor right away if you get chest pain, trouble seeing, hearing problems, ringing in the ears, memory loss, or severe dizziness.

Do not share this medicine with anyone who has not been prescribed this medicine.

Side Effects

The following is a list of some common side effects from this medicine. Please speak with your doctor about what you should do if you experience these or other side effects.

• dizziness or lightheadedness
• feeling of heat or flushing
• headaches
• low blood pressure
• muscle pain
• stuffy nose
• nausea
• stomach upset or abdominal pain

Call your doctor or get medical help right away if you notice any of these more serious side effects:

• ear problems (ringing in the ears, hearing loss)
• sudden change or loss of vision
• worsening breathing symptoms

A few people may have an allergic reaction to this medicine. Symptoms can include difficulty breathing, skin rash, itching, swelling, or severe dizziness. If you notice any of these symptoms, seek medical help quickly.