Capsule Versus Liquid

Radioiodine is available in a liquid solution or capsule. Capsules are more convenient, but have generally been more expensive. Liquid formulations may require extra measures to minimize radiation contamination at the time of administration. RAI in capsules and liquid are generally believed to be equivalent in efficacy, although there has been some concern regarding a reduction in RAI bioavailability from capsules, because of incomplete dissolution related to the amount of magnesium stearate in the capsule (29).

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