What is Radioactive iodine (I-131)?

Category: Prescription Drugs

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Radioactive iodine, also known as radioiodine, Iodine-131 and I-131, is selectively used for certain conditions including thyroid cancer and thyrotoxicosis (excessive levels of thyroid hormone in the blood).

Reported purpose & perceived effectiveness
Purpose Patients Evaluations Perceived Effectiveness
Thyroid cancer 200 5
Graves' disease 126 8
Papillary thyroid carcinoma 119 4
Hyperthyroidism 47 3
Follicular thyroid cancer 20 2

Show all 10 reasons taken


  • Major
  • Moderate
  • Slight
  • None
  • Can't tell

Side effects

Side effects as an overall problem

Side effects as an overall problem
Severity Evaluations Percentage
Severe 3
Moderate 3
Mild 7
None 7

Commonly reported side effects and conditions associated with Radioactive iodine (I-131)

Side effect Patients Percentage
Nausea 4
Dry mouth 3
Change in taste 2
Metallic taste in mouth 2
Blocked salivary duct 1
Constipation 1

Show all 26 reported side effects

Why patients stopped taking Radioactive iodine (I-131)

Multiple reasons could be selected

Reason Patients Percentage
Course of treatment ended 50
Other 12
Doctor's advice 8
Did not seem to work 2
See all 78 patients who've stopped taking Radioactive iodine (I-131)

Duration

Stopped taking Radioactive iodine (I-131)

Duration Patients Percentage
Less than 1 month 69
1 - 6 months 3
6 months - 1 year 3
2 - 5 years 1
5 - 10 years 1
Adherence
Adherence Evaluations Percentage
Always 17
Usually 0
Sometimes 0
Never taken as prescribed 3
Burden
Burden Evaluations Percentage
Very hard to take 5
Somewhat hard to take 7
A little hard to take 1
Not at all hard to take 7
Cost per month
Cost per month Evaluations Percentage
$200+ 2
$100-199 0
$50-99 1
$25-49 0
< $25 2
Not specified 15

What people switch to and from

Patients started taking Radioactive iodine (I-131) after stopping:

Treatment Patients Percentage
Methimazole (Tapazole) 4
Chemotherapy 1
Dabrafenib (Tafinlar) 1
Levothyroxine (Synthroid) 1
Propranolol (Inderal) 1
Last updated:
There are no evaluations for Radioactive iodine (I-131).