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Overview: Fosinopril is used to treat high blood pressure and heart failure. It works by helping your blood vessels relax and widen. Common side effects may include headache, cough, dizziness, and nausea and vomiting. Serious side effects are less common but can include swelling of the lips, face, tongue, or throat. Stop taking this medicine and contact your health care provider right away if you have this type of swelling. Before taking fosinopril, tell your health care provider about any health conditions you have or medicines you are taking.

Uses

What is fosinopril used for?

Fosinopril is commonly used for the following conditions.

  • To lower high blood pressure (hypertension)
  • Heart failure, a condition in which the heart is not pumping as well as it should 

Fosinopril may also be used for other conditions as determined by your health care provider.

How does fosinopril work (mechanism of action)?

Fosinopril blocks the angiotensin-converting enzyme (ACE) from forming a hormone called angiotensin II. When angiotensin II binds to receptors, it causes your blood vessels to constrict. Blocking the formation of angiotensin II helps your blood vessels relax so that blood can move through them more easily. These effects can help your heart work better, lower blood pressure, and may reduce your risk for heart attack and stroke.

How is fosinopril supplied (dosage forms)?

Brands and other names

  • Monopril

Dosage forms and strengths

  • 10 mg oral tablets
  • 20 mg oral tablets
  • 40 mg oral tablets

How should I store fosinopril?

Fosinopril should be stored at room temperature, between 68 F and 77 F (20 C and 25 C). It can be exposed to temperatures between 59 F and 86 F (15 C and 30 C) for shorter periods of time, such as when transporting it. Store in a cool, dry place, in a tightly closed container. Protect from moisture and light.

Side Effects

What are the most common side effects of fosinopril?

The most common side effects of fosinopril are listed below. Tell your health care provider if you have any of these side effects that bother you.

  • Headache
  • Cough
  • Dizziness
  • Nausea and vomiting

There may be other side effects of fosinopril that are not listed here. Contact your health care provider if you think you are having a side effect of a medicine. In the U.S., you can report side effects to the FDA at www.fda.gov/medwatch or by calling 800-FDA-1088 (800-332-1088). In Canada, you can report side effects to Health Canada at www.health.gc.ca/medeffect or by calling 866-234-2345.

What are the serious side effects of fosinopril?

While less common, the most serious side effects of fosinopril are described below, along with what to do if they happen.

Angioedema. Fosinopril may cause a rare reaction called angioedema. The usual symptoms of this reaction include swelling of the lips, face, tongue, or throat. Stop using the medicine and contact your health care provider if you have this type of swelling. If you are having trouble breathing, get medical attention right away.

Low Blood Pressure (Hypotension). Fosinopril may cause low blood pressure. Low blood pressure is more likely to occur if you have excessive sweating or persistent or severe vomiting or diarrhea. If you feel faint or dizzy, lie down. Tell your health care provider right away if you have any of the following symptoms of low blood pressure.

  • Dizziness, feeling lightheaded, or fainting
  • Confusion
  • Feeling weak or tired

Liver Damage. Liver damage, also called hepatotoxicity, can happen when taking fosinopril. Call your health care provider right away if you have any of the following symptoms of liver damage.

  • Nausea or vomiting
  • Stomach or belly pain
  • Fever
  • Weakness or unusual tiredness
  • Itching
  • Loss of appetite
  • Light-colored poop
  • Dark-colored urine (pee)
  • Your skin or the whites of your eyes turning yellowish in color (also called jaundice)

Kidney Damage.Kidney damage can happen when taking fosinopril. Call your health care provider right away if you have any of the following symptoms of kidney damage.

  • Reduced need to pee
  • Swelling in your feet, ankles, or legs
  • Weakness or unusual tiredness
  • A hard time catching your breath or chest pain/pressure
  • Confusion
  • Nausea
  • Seizures

High Potassium Level (Hyperkalemia). Fosinopril can cause a high potassium level (hyperkalemia), which can be serious and may lead to death. Your health care provider may check your potassium levels, especially if you take certain other medicines. Call your health care provider right away if you have any of the following symptoms of a high potassium level. 

  • Muscle weakness or unusual tiredness
  • Slow heartbeat or feeling of skipped heartbeats 
  • Nausea or vomiting
  • Trouble breathing
  • Abnormal heart rhythm

Low Neutrophil Levels (Neutropenia). Fosinopril may cause low levels of a type of white blood cell (called neutrophils), which is known as neutropenia. Neutrophils help prevent infection. Having a low level of neutrophils may increase your risk of infection. Tell your health care provider if you have any of the following symptoms of low neutrophil levels.

  • Fever, chills, or sweats
  • Tiredness
  • Sore throat, cough, or shortness of breath
  • Mouth or throat sores
  • Swollen lymph nodes

Severe Allergic Reactions. Fosinopril may cause allergic reactions, which can be serious. Stop using fosinopril and get help right away if you have any of the following symptoms of a serious allergic reaction.

  • Breathing problems or wheezing
  • Racing heart
  • Fever or general ill feeling
  • Swollen lymph nodes
  • Swelling of the face, lips, mouth, tongue, or throat
  • Trouble swallowing or throat tightness
  • Itching or skin rash
  • Bumps on the skin called hives that can be red, pink, white, or brown depending on your skin tone
  • Nausea or vomiting
  • Dizziness, feeling lightheaded, or fainting
  • Stomach cramps
  • Joint pain

Warnings & Precautions

Who should not use fosinopril?

Allergies to Ingredients. People who are allergic to any of the following should not take fosinopril.

  • Fosinopril
  • Monopril
  • Any other medicine known as an ACE inhibitor
  • Any of the ingredients in the specific product dispensed

Your pharmacist can tell you all of the ingredients in the specific fosinopril products they stock.

History of Angioedema. Fosinopril may cause a rare reaction called angioedema, where there is swelling under the skin. This medicine should not be used if you have had angioedema. 

Drug Interactions. Fosinopril should not be taken while you are using certain other medicines. Before taking fosinopril, tell your health care provider about any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using. See the Interactions section for more details.

What should I know about fosinopril before using it?

Do not take fosinopril unless it has been prescribed to you by a health care provider. Take it as prescribed.

Do not share fosinopril with other people, even if they have the same condition as you. It may harm them.

Keep fosinopril out of the reach of children.

Fosinopril can affect your alertness or coordination. Do not drive or do other activities that require alertness or coordination until you know how fosinopril affects you.

What should I tell my health care provider before using fosinopril?

Tell your health care provider about all of your health conditions and any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using. This will help them know if fosinopril is right for you.

In particular, make sure that you discuss any of the following.

Current and Past Health Conditions. Tell your health care provider if you have any of the following.

  • Heart problems
  • Kidney problems
  • Liver problems
  • Diabetes
  • Electrolyte imbalance, such as high or low levels of sodium or potassium
  • Persistent or severe vomiting or diarrhea

Pregnancy. Fosinopril can cause death or serious harm to a fetus if taken during pregnancy. Tell your health care provider if you are pregnant or plan to become pregnant. If you become pregnant, stop taking fosinopril right away and contact your health care provider.

Breastfeeding. Fosinopril may pass into breast milk. Tell your health care provider if you are breastfeeding or plan to breastfeed.

Interactions

Does fosinopril interact with foods or drinks?

There are no known interactions between fosinopril and foods or drinks.

It is unknown if drinking alcohol will affect fosinopril. The risk of dizziness may be increased if you drink alcohol while taking fosinopril.

Does fosinopril interact with other medicines (drug interactions)?

Always tell your health care provider about any prescription or over-the-counter (OTC) medicines, vitamins/minerals, herbal products, and other supplements you are using.

In particular, make sure that you discuss if you are using any of the following before taking fosinopril.

  • Aliskiren (Tekturna), which is a medicine for high blood pressure
  • Entresto (sacubitril/valsartan), which is a medicine for heart failure 
  • A supplement or salt-substitute containing potassium
  • An antacid, such as aluminum hydroxide, magnesium hydroxide, and others
  • A diuretic, also called a water pill, which is a medicine used to reduce edema (fluid retention) and blood pressure
  • A nonsteroidal anti-inflammatory drug (NSAID), such as ibuprofen, naproxen, and others, which is in many prescription and OTC products for pain, swelling, and fever
  • Lithium, which is a medicine for certain mental health conditions
  • An angiotensin-converting enzyme (ACE) inhibitor, which is a medicine for high blood pressure, heart failure, and certain kidney problems
  • An angiotensin II receptor blocker (ARB), which is a medicine for high blood pressure, heart failure, and other heart conditions
  • A medicine such as everolimus (Afinitor, Zortress), sirolimus (Rapamune and others), or temsirolimus (Torisel), which is commonly used to treat cancer or after an organ transplant
  • Any medicine for high blood pressure

This may not be a complete list of medicines that can interact with fosinopril. Always check with your health care provider.

Does interact with other drugs you are taking?

Enter your medication into the WebMD interaction checker

Overdose/Missed Dose

What should I do if I accidentally use too much fosinopril?

If you or someone else has used too much fosinopril, get medical help right away, call 911, or contact a Poison Control center at 800-222-1222.

What should I do if I miss a dose of fosinopril?

If you miss a dose, take it as soon as you remember. If it is almost time for your next dose, skip the missed dose and only take the next dose. Do not take double or extra doses.