What is Westhroid: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 31, 2020

Westhroid overview

BRAND NAMES:

  • WP Thyroid, Armour Thyroid, Nature-Throid, NP Thyroid, Westhroid, Armour Thyroid, Cytomel, Euthyrox, Levoxyl, Nature-Throid, NP Thyroid, NP Thyroid 120, Synthroid, Thyrolar, Westhroid, WP Thyroid, Unithroid

Generic Names:

  • Westhroid

Uses:

  • Treats hypothyroidism (the body does not produce enough thyroid hormone)., Treats hypothyroidism (the body does not produce enough thyroid hormone).

Therapeutic Classes:

  • Thyroid Supplement, Diagnostic Agent, Thyroid Function, Endocrine-Metabolic Agent, Thyroid Supplement

Forms:

  • Capsule, Tablet, Tablet, Capsule

How it’s taken:

  • By mouth, By mouth

What is Westhroid used for?

Nature-Throid is a man-made combination of hormones usually produced by the thyroid gland to control the energy and metabolism in the body. It works by increasing the low level of thyroid hormone in the body. In addition to treating hypothyroidism, this medication is also used to treat or prevent goiter and is used to test patients for thyroid disorders.

What form(s) does Westhroid come in

  • Capsule

  • Tablet

  • Tablet

  • Capsule

What are common Westhroid doses?

  • Tablet 32.5MG

  • Tablet 65MG

  • Tablet 97.5MG

  • Tablet 130MG

  • Tablet 195MG

Common Westhroid prescriptions

  • Westhroid
    130mg tablet

  • Westhroid
    195mg tablet

  • Westhroid
    32.5mg tablet

  • Westhroid
    65mg tablet

  • Westhroid
    97.5mg tablet

How to take Westhroid

  • Your doctor will tell you how much to take and how often

  • Take your medicine at the same time every day.

  • Take the medicine on an empty stomach.

  • Your doctor will tell you how much to take and how often

  • Take your medicine at the same time every day.

  • Take the medicine on an empty stomach.

  • Your doctor will tell you how much to take and how often

  • Take your medicine at the same time every day.

  • Take the medicine on an empty stomach.

  • Do not stop taking this medicine without first checking with your doctor, you may need to take smaller and smaller doses before completely stopping the medicine.

  • Your doctor will tell you how much to take and how often

  • Take your medicine at the same time every day.

  • Take the medicine on an empty stomach.

  • Do not stop taking this medicine without first checking with your doctor, you may need to take smaller and smaller doses before completely stopping the medicine.

What to do if you miss a dose of Westhroid

  • Take the missed dose take as soon as possible.

  • Skip the missed dose if it is almost time for your next regular dose.

  • You should not use two doses at the same time.

  • Take your medicine as soon as you remember that you missed a dose.

  • Skip the missed dose if it is almost time for your next dose.

  • You should not use two doses at the same time.

Westhroid contraindications

  • You should not use this medicine if you have had an allergic reaction to any type of thyroid hormone.

  • You should not use this medicine if you have had an allergic reaction to any type of thyroid hormone or if you have an overactive thyroid gland.

Westhroid warnings

  • Talk with your doctor before taking this medicine if you have heart disease, high blood pressure, or diabetes.

  • Do not stop taking this medicine without first checking with your doctor.

  • Chest pain

  • Severe irritability or nervousness, tremors

  • Fast or irregular heartbeat

  • Severe diarrhea or intense sweating

  • Check with your doctor before taking this medicine if you have heart disease, high blood pressure, diabetes, or an underactive adrenal or pituitary gland.

  • Tell your doctor if you are pregnant or breastfeeding.

  • Large doses of thyroid hormones, especially when taken with diet pills, can result in dangerous side effects.

  • Make sure you see your doctor for regular check-ups so your condition can be followed closely.

  • Inability to stand heat

  • Extreme nervousness or irritability, tremors

  • Severe diarrhea, intense sweating

Westhroid interactions

  • Make sure your doctor knows if you are taking a blood thinner (Coumadin®), cholestyramine (Questran®), medicine for diabetes (insulin, Diabenese®, Glucotrol®), estrogens, birth control pills, or products used for colds, asthma, appetite control, hay fever, or sinus problems.

  • Tell your doctor if you are pregnant or breastfeeding.

  • Large doses of thyroid hormones, especially when taken with diet pills, can result in dangerous side effects.

  • Make sure you see your doctor for regular check-ups so your condition can be followed closely.

  • If you are taking cholestyramine (Questran®), take it either 4 hours before or 4 hours after you take levothyroxine.

  • Do not stop taking this medicine without first checking with your doctor.

Westhroid side effects

Serious Side Effects

  • Skin rash or hives

  • Shortness of breath or trouble breathing

  • Chest pain

  • Fast or pounding heartbeat

  • Inability to stand heat

  • Extreme nervousness or irritability, tremors

  • Severe diarrhea, intense sweating

  • Skin rash or hives with intense itching

  • Shortness of breath or trouble breathing

  • Chest pain

  • Fast or irregular heartbeat

  • Severe irritability or nervousness, tremors

  • Severe diarrhea or intense sweating

Less Serious Side Effects

  • Irregular menstrual periods

  • Headache

  • Appetite changes, weight loss

  • Anxiety

  • Trouble sleeping

  • Anxiety

  • Appetite changes, weight loss

  • Irregular menstrual periods

  • Headache

  • Trouble sleeping

Westhroid News & Research

Armour Thyroid alternatives: What can I take instead of Armour Thyroid ?

Thyroid health 101: Common problems you should watch for

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