Drug Name

Lisinopril

Drug Uses

Lisinopril is used to treat elevated blood pressure and heart failure.

How to use

Lisinopril should be taken at doses specifically directed by the physician. Lisinopril can be taken with or without food. Lisinopril should be taken at the same time each day to maintain consistent blood levels. Lisinopril should not be taken within two hours of taking an antacid since the antacid binds lisinopril and prevents its absorption. Lisinopril is often tapered when discontinuing.

Drug Class and Mechanism

Lisinopril is an angiotensin converting enzyme (ACE) inhibitor. Angiotensin is a chemical that is made by the body continuously. It narrows blood vessels and thereby maintains (elevates) blood pressure. When the enzyme is blocked by lisinopril, angiotensin cannot be converted into its active form. As a result, blood pressure falls.

Interestingly, lisinopril and other ACE inhibitors were developed from the venom of a poisonous Brazilian snake.

Missed Dose

Take the missed dose as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and take only your next regularly scheduled dose. Do not take a double dose of this medication.

Storage

Lisinopril should be stored in a dry place at 15-30 degrees C (59-86 degrees F).

Warnings/Precautions

Use caution when driving, operating machinery, or performing other hazardous activities. Lisinopril may cause dizziness or drowsiness. If you experience dizziness or drowsiness, avoid these activities and notify your doctor. Also use caution when rising from a sitting or lying position. Use alcohol cautiously. Alcohol may increase drowsiness and dizziness while you are taking lisinopril. Alcohol may further lower blood pressure and increase drowsiness and dizziness when you are taking lisinopril. Do not use salt substitutes or potassium supplements while taking lisinopril except under the supervision of your doctor. Heavy sweating, vomiting, diarrhea, or other causes of fluid loss may lead to very low blood pressure, dizziness, and fainting during therapy with lisinopril. Maintain proper fluid intake to prevent dehydration and related side effects. First doses of lisinopril or any ACE inhibitor should be taken under observation if the patient also is taking diuretics (water pills). In such patients, blood pressure can drop quickly (though this is unusual). In general, lisinopril should not be taken with potassium supplements or diuretics that conserve potassium, e.g., Dyazide, since blood potassium levels may rise to dangerous levels. Lisinopril should not be taken during pregnancy.

Possible Side Effects

Get emergency medical help if you have any of these signs of an allergic reaction: hives; severe stomach pain; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects:

• feeling light-headed, fainting;
• urinating more or less than usual, or not at all;
• fever, chills, body aches, flu symptoms;
• tired feeling, muscle weakness, and pounding or uneven heartbeats;
• chest pain; or
• swelling, rapid weight gain.

Less serious lisinopril side effects may include:

• cough;
• dizziness, drowsiness, headache;
• depressed mood;
• nausea, vomiting, diarrhea, upset stomach; or
• mild skin itching or rash.

More Information

Your pharmacist can provide more information about lisinopril.