"The US Food and Drug Administration (FDA) has approved calcifediol (Rayaldee, Opko Health, Inc) for the treatment of adults with secondary hyperparathyroidism (SHPT) associated with vitamin D insufficiency (serum total 25-hydroxyvitamin D "...
Tapazole Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Tapazole (methimazole) is an anti-thyroid drug used to treat hyperthyroidism (overactive thyroid). Tapazole is also used before thyroid surgery or radioactive iodine treatment. Tapazole is available in generic form. Common side effects of Tapazole include
- stomach upset,
- mild skin rash/itching,
- muscle/joint/nerve pain,
- swelling, or
- hair loss.
Tell your doctor if you experience rare but serious side effects of Tapazole including
- yellowing eyes/skin (jaundice),
- dark urine,
- severe stomach or abdominal pain,
- persistent nausea or vomiting, or
- changes in the amount of urine.
The initial adult dose of Tapazole is between 15-60 mg/day, depending on the severity of the hyperthyroidism, divided into three doses taken 8 hours apart. Some products that may interact with Tapazole include blood thinners (such as warfarin), digoxin, and theophylline. Tapazole is not recommended for use during the first 3 months of pregnancy and should be used only when prescribed during the last 6 months of pregnancy. Discuss the risks and benefits with your doctor. This medication passes into breast milk. Consult your doctor before breast-feeding.
Our Tapazole Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Tapazole in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using methimazole and call your doctor at once if you have a serious side effect such as:
- fever, chills, sore throat, body aches, flu symptoms;
- easy bruising or bleeding, unusual weakness;
- blood in your urine or stools;
- severe blistering, peeling, and red skin rash; or
- nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).
Less serious side effects may include:
- headache, drowsiness, dizziness;
- mild nausea, vomiting, or stomach upset;
- itching, minor skin rash;
- muscle, joint, or nerve pain;
- swelling; or
- hair loss.
Read the entire detailed patient monograph for Tapazole (Methimazole)
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Tapazole Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these rare but serious side effects occur: yellowing eyes/skin, dark urine, severe stomach/abdominal pain, persistent nausea/vomiting, joint/muscle pain, change in the amount of urine.
This medication may rarely cause very serious blood disorders (such as a low number of red cells, white cells, and platelets), especially during the first few months of treatment. Tell your doctor immediately if you develop any of the following symptoms: signs of infection (such as fever, persistent sore throat), easy bruising/bleeding, unusual tiredness.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Tapazole (Methimazole)
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Tapazole FDA Prescribing Information: Side Effects
Major adverse reactions (which occur with much less frequency than the minor adverse reactions) include inhibition of myelopoieses (agranulocytosis, granulocytopenia, thrombocytopenia, and aplastic anemia), drug fever, a lupus-like syndrome, insulin autoimmune syndrome (which can result in hypoglycemic coma), hepatitis (jaundice may persist for several weeks after discontinuation of the drug), periarteritis, and hypoprothrombinemia. Nephritis occurs very rarely.
Minor adverse reactions include skin rash, urticaria, nausea, vomiting, epigastric distress, arthralgia, paresthesia, loss of taste, abnormal loss of hair, myalgia, headache, pruritus, drowsiness, neuritis, edema, vertigo, skin pigmentation, jaundice, sialadenopathy, and lymphadenopathy.
Read the entire FDA prescribing information for Tapazole (Methimazole)
Additional Tapazole Information
Tapazole - User Reviews
Tapazole User Reviews
Now you can gain knowledge and insight about a drug treatment with Patient Discussions.
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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