Product Information

For all uses of this drug:

  • Tell all of your health care providers that you take this drug. This includes your doctors, nurses, pharmacists, and dentists.
  • Avoid driving and doing other tasks or actions that call for you to be alert until you see how this drug affects you.
  • To lower the chance of feeling dizzy or passing out, rise slowly over a few minutes when sitting or lying down. Be careful climbing stairs.
  • Do not take this drug with other drugs used to treat a change in sex ability.
  • Talk with your doctor before you drink alcohol.
  • Very bad and sometimes deadly side effects like a heartbeat that does not feel normal, heart attack, stroke, and very bad high blood pressure have happened with this drug. Talk with the doctor.
  • A very bad eye problem has rarely happened with this drug. This may lead to a change in eyesight and sometimes loss of eyesight, which may not come back. Talk with the doctor.
  • If you are 65 or older, use this drug with care. You could have more side effects.
  • Tell your doctor if you are pregnant or plan on getting pregnant. You will need to talk about the benefits and risks of using this drug while you are pregnant.
  • Tell your doctor if you are breast-feeding. You will need to talk about any risks to your baby.

Impotence:

  • This drug does not stop the spread of diseases like HIV or hepatitis that are passed through blood or having sex. Do not have any kind of sex without using a latex or polyurethane condom. Do not share needles or other things like toothbrushes or razors. Talk with your doctor.
  • This drug is not approved for use in children. Talk with the doctor.
  • This drug is not approved for use in women.

High pressure in the lungs:

  • This drug is not approved for use in children. A higher rate of death has been seen in children as the dose of this drug gets higher. However, your child’s doctor may decide the benefits of taking this drug may outweigh the risks. If your child has been given this drug, talk with the doctor for information about the benefits and risks. Talk with the doctor if you have questions about giving this drug to your child.

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Chest pain or pressure or a fast heartbeat
  • A heartbeat that does not feel normal
  • Dizziness or passing out
  • Very bad headache
  • Coughing up blood
  • Very upset stomach or throwing up
  • Weakness on 1 side of the body, trouble speaking or thinking, change in balance, drooping on one side of the face, or blurred eyesight
  • Change in eyesight
  • Loss of eyesight
  • Change in hearing
  • Ringing in ears
  • Memory problems or loss
  • Seizures
  • Shortness of breath
  • Swelling in hands or feet
  • Fever

Call your doctor right away if you have a painful erection (hard penis) or an erection that lasts for longer than 4 hours. This may happen even when you are not having sex. If this is not treated right away, it may lead to lasting sex problems and you may not be able to have sex.

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away.

For all uses of this drug:

  • Loose stools (diarrhea)
  • Flushing
  • Headache
  • Belly pain or heartburn
  • Upset stomach
  • Stuffy nose
  • Runny nose
  • Muscle pain

Impotence:

  • Back pain

High pressure in the lungs:

  • Redness
  • Nosebleed
  • Not able to sleep

All other oral products:

  • Store at room temperature.

All oral products:

  • Protect from light.
  • Store in a dry place. Do not store in a bathroom.
  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else’s drugs.
  • Keep a list of all your drugs (prescription, natural products, vitamins, OTC) with you. Give this list to your doctor.
  • Talk with the doctor before starting any new drug, including prescription or OTC, natural products, or vitamins.
  • Some drugs may have another patient information leaflet. If you have any questions about this drug, please talk with your doctor, nurse, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

This information should not be used to decide whether or not to take this medicine or any other medicine. Only the healthcare provider has the knowledge and training to decide which medicines are right for a specific patient. This information does not endorse any medicine as safe, effective, or approved for treating any patient or health condition. This is only a brief summary of general information about this medicine. It does NOT include all information about the possible uses, directions, warnings, precautions, interactions, adverse effects, or risks that may apply to this medicine. This information is not specific medical advice and does not replace information you receive from the healthcare provider. You must talk with the healthcare provider for complete information about the risks and benefits of using this medicine.

Last Reviewed Date: 2015-12-07

©2017 Wolters Kluwer Clinical Drug Information, Inc. and its affiliates and/or licensors. All rights reserved.