What is Np Thyroid: Uses, Warnings & Interactions

Medically reviewed by Kristi C. TorresPharm.D.
Licensed Pharmacist
Updated Nov 29, 2023  •  Published Dec 30, 2020
Fact Checked

Np Thyroid overview

BRAND NAMES:

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

Generic Names:

  • Np Thyroid

Uses:

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

Therapeutic Classes:

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

Forms:

  • Capsule, Tablet

How it’s taken:

  • By mouth

What is Np Thyroid used for?

Armour Thyroid is a medication that has been used to treat underactive thyroid problems (hypothyroidism) caused by a variety of thyroid disorders. Armour Thyroid is a thyroid extract from animal thyroid glands.

Armour Thyroid is the brand name for desiccated thyroid or thyroid extract from pork sources. Desiccated thyroid is a natural product that has been available for over 100 years. For the treatment of hypothyroidism, the use of Armour Thyroid is not as common as in the past. Due to its dependency on a natural source, there have been times where the raw materials needed to produce this drug are unavailable, and the drug is in short supply.

  • Thyroid hormone prescription medications are best taken first thing in the morning, at least 1 hour before you have anything else to eat or drink. 

  • It is important to take your dose every day and not miss a dose. Missing doses can affect your thyroid levels a great deal and make it hard for your doctor to manage your condition.

  • Your doctor will need to monitor other functions in your body such as heart rate, blood pressure, and blood glucose to make sure all aspects of your health are being addressed.

  • While there are many benefits of this medication, there are some side effects as well. If you experience serious adverse events such as chest pain or rapid heart beats, contact your doctor or seek care immediately.

What form(s) does Np Thyroid come in

  • Tablet 

    • 15 mg

    • 30 mg

    • 60 mg

    • 90 mg

    • 120 mg

What are common Np Thyroid doses?

In the treatment of hypothyroidism, regardless of the cause, there are different dosing strategies based on age, weight, and current thyroid levels. Dosing is typically started low, and the blood test is repeated at a frequent interval to determine if the dose needs to continue to increase. 

  • Adults: Begin with 15 mg or 30 mg once daily. Increase by 15 mg increments every 2 to 3 weeks. The majority of patients will achieve normal blood levels at doses between 60 mg and 120 mg daily.

  • Children 6 years and older: Begin with 15 mg or 30 mg once daily. Increase by 15 mg increments every 2 to 3 weeks. The majority of patients will achieve normal blood levels at doses between 60 mg and 90 mg daily. Adolescents may need to go above 90 mg.

  • Children under 6 years of age: Begin with a low dose once daily. Increase by 15 mg increments every 2 to 3 weeks. The majority of patients will achieve normal blood levels at doses between 30 mg and 60 mg daily.

  • Special conditions such as myxedema coma or thyroid cancer may require doing our of these ranges.

Common Np Thyroid prescriptions

  • NP Thyroid
    90 tablets bottle

  • NP Thyroid
    120mg tablet

  • NP Thyroid
    15mg tablet

  • NP Thyroid
    30mg tablet

  • NP Thyroid
    60mg tablet

  • NP Thyroid
    90mg tablet

How to take Np Thyroid

  • 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 Np Thyroid

  • 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.

Np Thyroid contraindications

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

Np Thyroid warnings

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

  • 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.

Np Thyroid interactions

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

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

Np Thyroid side effects

Some side effects to NP Thyroid therapy can be bothersome. Some may become anxious or have trouble sleeping. There are some potentially very serious side effects to thyroid hormone therapy that require immediate attention from your medical professional. If you experience chest pain or rapid heartbeat, these could be signs of something serious like a myocardial infarction, the medical term for heart attack. If you have a history of a cardiac medical condition, this is more likely to happen when you take NP Thyroid. Be upfront about your medical history when seeing a new prescriber. Your doctor may start your dose very low and make small incremental changes to try and avoid this effect. Older adults are also at a higher risk of cardiac events.

Women on higher doses of NP Thyroid may experience bone mineral density loss. It is important to do regular screenings, especially in postmenopausal women taking thyroid therapy. This is not a complete list of possible side effects. You should check with your pharmacist for a complete list. 

Serious Side Effects

  • Shortness of breath or trouble breathing

  • Chest pain

  • Inability to stand heat

  • Skin rash or hives with intense itching

  • Fast or irregular heartbeat

  • Severe irritability or nervousness, tremors

  • Severe diarrhea or intense sweating

  • Irregular blood sugar levels

  • Decreased bone mineral density

Less Serious Side Effects

  • Irregular menstrual periods

  • Headache

  • Appetite changes, weight loss

  • Anxiety

  • Trouble sleeping

Sources:

Medically reviewed by Kristi C. TorresPharm.D.
Licensed Pharmacist

Kristi C. Torres, Pharm.D., is a 2005 graduate of The University of Texas at Austin. Her professional background includes academic teaching roles, district-level management for a nationwide pharmacy chain, and clinic-based pharmacy management. Dr. Torres has a wide range of experience in pharmacy operations and has traveled to many states to open and convert clinic-based pharmacies for one of the largest healthcare systems in the nation.

Currently, she works for Tarrytown Expocare Pharmacy in Austin, Texas, serving the intellectual and developmental disability community. There, she leads the order entry team, overseeing orders from across the country.

Dr. Torres began working in pharmacy at the age of 16 in a small East Texas town. She currently resides in Round Rock, Texas, with her daughter and a Shih-Tzu puppy.

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