Telmisartan

High Blood Pressure

Telmisartan is primarily prescribed to treat hypertension (high blood pressure). Lowering blood pressure helps prevent serious health issues such as strokes, heart attacks, and kidney problems. It may be used alone or in combination with other types of blood pressure medications.

Cardiovascular Risk Reduction

This medication is also used to reduce the risk of heart attack, stroke, or death from cardiovascular causes. This use is typically reserved for individuals who are at least 55 years old and are at high risk for these events but cannot tolerate a different class of drugs known as ACE inhibitors.

Combination Treatments

In some cases, telmisartan is prescribed as a combination product with other medications, such as:

• Hydrochlorothiazide (a diuretic or water pill)
• Amlodipine (a calcium channel blocker)

Mechanism of Action

Telmisartan works by blocking the action of a natural hormone in the body called angiotensin II. This hormone is a potent vasoconstrictor, meaning it causes the muscles in the walls of the blood vessels to tighten and narrow, which increases blood pressure.

By blocking the receptors for this hormone, telmisartan allows the blood vessels to:

• Relax and widen: This reduces the resistance the heart faces when pumping blood, leading to lower blood pressure.
• Improve blood flow: Wider vessels allow blood to circulate more easily throughout the body.
• Reduce heart strain: Because the vessels are not constricted, the heart does not have to work as hard to move blood.

Lowering high blood pressure through this mechanism helps prevent long-term complications such as strokes, heart attacks, and kidney problems.

Common Side Effects

Many people using telmisartan do not have serious side effects. Common symptoms may include:

• Back pain
• Sinus pain or congestion
• Diarrhea
• Sore throat or cough
• Dizziness
• Fatigue
• Muscle pain

Serious Side Effects

Seek medical attention immediately if you experience any of the following serious symptoms:

• Signs of an allergic reaction, including swelling of the face, lips, tongue, or throat
• Difficulty breathing or swallowing
• Fainting or feeling like you might pass out
• Hoarseness
• Signs of high potassium, such as muscle weakness or a slow or irregular heartbeat
• Changes in urination or swelling in the legs or feet, which may indicate kidney issues

Fetal Toxicity Warning

Telmisartan can cause serious injury or death to an unborn baby if taken during pregnancy. Use of this medication must be stopped as soon as pregnancy is detected. If pregnancy is planned or confirmed, a healthcare provider should be consulted immediately to discuss alternative treatments.

Major Precautions

• Low Blood Pressure (Hypotension): This medication may cause a significant drop in blood pressure, particularly in individuals who are dehydrated, on a low-salt diet, or taking diuretics (water pills). This can lead to dizziness or fainting.
• Kidney Function: Changes in kidney function may occur. People with pre-existing kidney disease, severe heart failure, or narrowing of the arteries to the kidneys may be at higher risk for kidney failure while taking this drug.
• High Potassium (Hyperkalemia): Telmisartan can increase potassium levels in the blood. This risk is higher for those with kidney impairment, diabetes, or those using potassium supplements or salt substitutes containing potassium.
• Liver Disease: Caution is advised for individuals with liver problems, as the drug is primarily cleared through the liver and may accumulate in the body.

Contraindications

Telmisartan should not be used in combination with aliskiren in patients who have diabetes. It is also contraindicated for individuals with a known hypersensitivity to telmisartan or any of its ingredients.

Monitoring

Healthcare providers typically monitor blood pressure, kidney function tests, and serum potassium levels regularly while a patient is taking telmisartan to ensure the medication is working safely.

Pregnancy

Telmisartan carries a boxed warning because it can cause severe injury or death to a fetus when used during pregnancy. The risk is highest during the second and third trimesters. If you discover you are pregnant while taking this medication, you should stop taking it and contact your healthcare provider right away.

Potential complications for the baby when telmisartan is used during pregnancy include:

• Reduced amniotic fluid (oligohydramnios), which can lead to lung underdevelopment and skeletal deformities.
• Impaired kidney function or kidney failure in the newborn.
• Underdevelopment of the skull.
• Fetal death.

If you are planning to become pregnant, discuss alternative blood pressure treatments with your doctor before conception.

Breastfeeding

It is not known if telmisartan passes into human breast milk. Because of the potential for serious side effects in a nursing infant, breastfeeding is generally not recommended while using this medication. You and your healthcare provider should decide whether to stop breastfeeding or stop taking the medication, based on the importance of the drug to your health.

Available Forms

Telmisartan is available as a tablet to be taken by mouth. It is provided as a single-ingredient medication or in combination with other drugs.

Combination Tablets

Telmisartan may be found in combination tablets that include other active ingredients, such as:

• Amlodipine
• Hydrochlorothiazide

FDA Approval and Indications

Telmisartan was approved by the U.S. Food and Drug Administration (FDA) to treat high blood pressure (hypertension) in adults. It may be used alone or in combination with other blood pressure medications. Additionally, it is approved to reduce the risk of heart attack, stroke, or death from cardiovascular causes in individuals aged 55 and older who are at high risk for these events and cannot take ACE inhibitors.

Boxed Warning: Fetal Toxicity

The FDA has issued a boxed warning for telmisartan because it can cause serious injury or death to an unborn baby if taken during pregnancy. Healthcare providers advise that the medication should be discontinued as soon as pregnancy is detected.

Safety Communications

The FDA has issued safety communications regarding the use of telmisartan in combination with certain other medications:

• Aliskiren: Using telmisartan with aliskiren is contraindicated in patients with diabetes and should be avoided in patients with moderate to severe kidney impairment due to increased risks of kidney failure, low blood pressure, and high potassium levels.
• Dual Blockade: Combining telmisartan with other drugs that affect the renin-angiotensin system, such as ACE inhibitors, is generally not recommended as it may increase the risk of side effects without providing additional benefit.

The cost of telmisartan can vary based on several factors related to your prescription and insurance coverage. Because it is available as a generic drug, it is often more affordable than brand-name alternatives.

Factors Influencing Cost

• Generic Availability: Telmisartan is produced by multiple manufacturers as a generic tablet. Generic medications are required to have the same active ingredients and effectiveness as brand-name drugs but usually cost significantly less.
• Insurance Coverage: Most health insurance plans cover generic telmisartan. Your specific out-of-pocket cost, such as a copay or coinsurance, will depend on your plan's specific benefits and drug formulary.
• Prescription Details: The total price may be affected by the dosage strength (20 mg, 40 mg, or 80 mg) and the number of tablets dispensed at one time.

To find the most accurate price, you should consult your pharmacist or contact your insurance provider. They can provide information on your specific coverage and any potential savings programs that may be available.