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Thyrogen

Thyrogen Side Effects

Allison Baxley, PharmD, BCOPDaisy Chau, PharmD
Reviewed by Allison Baxley, PharmD, BCOP, Daisy Chau, PharmD
Last reviewed on September 3, 2025

The following side effects may get better over time as your body gets used to the medication. Let your healthcare provider know immediately if you continue to experience these symptoms or if they worsen over time.

Common Side Effects

  • Nausea (11%)
  • Headache (6%)

Less Common Side Effects

Thyrogen serious side effects

Contact your healthcare provider immediately if you experience any of the following.

  • High thyroid hormone levels: fast or irregular heartbeat, feeling suddenly nervous, feeling warm, sweating, weight loss
  • Stroke: sudden and severe headache, weakness on one side of the body, difficulty speaking
  • Sudden tumor growth: sudden weakness or paralysis on one side of the, sudden vision loss, swelling in the throat, pain at the cancer site, or trouble breathing
When do Thyrogen possible side effects begin and end?
Time passed since treatment started:
M
H
D
W
M
Injection-site reactions
High thyroid hormone levels
Stroke
Sudden tumor growth
Seek immediate medical care if you experience this side effect.

Source: DailyMed

The following Thyrogen side effects have also been reported

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur:

More common

Inability to move the legs or arms

paralysis of one side of the body

Rare

Faintness

feeling of warmth

skin rash, hives, welts, itching, or redness

itching, redness, or swelling at the injection site

loss of vision

redness of the face, neck, arms, and occasionally, upper chest

tightness of the throat

Incidence not known

Chills

confusion

coughing

difficult or labored breathing

difficulty with speaking

difficulty with swallowing

dizziness

double vision

fast, slow, or irregular heartbeat

fever

headache

hoarseness

inability to move the facial muscles

muscle or joint pain

sore throat

voice changes

Get emergency help immediately if any of the following symptoms of overdose occur:

Symptoms of overdose

Blurred vision

chest pain

dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position

fast or irregular heartbeat

increased sweating

irritability

nausea

nervousness

sweating

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

Frequent urge to urinate

stomach discomfort

Less common

Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings

diarrhea

lack or loss of strength

stuffy or runny nose

trouble sleeping

unusual tiredness or weakness

vomiting

Incidence not known

Bleeding, blistering, burning, coldness, discoloration of skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at injection site

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.

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