Crosscheck

Your medical. Crosschecked.

Other

Levothyroxine

Acceptable medication on the FAA's hypothyroidism worksheet
Other names: levothyroxine sodium, Synthroid, Levothyroid

Taken for: HypothyroidismTaking it for something else? The entries here do not cover that use. The FAA may address it in the guidance for your condition. Ask your examiner.

FAA guidance

Acceptable with conditions.

Examiner

CACI: the examiner can issue when the condition's worksheet criteria are met. Applicants for first- or second-class must provide the worksheet's information annually; applicants for third-class with each required exam

FAA label

ACCEPTABLE

Source: FAA, CACI – Hypothyroidism Worksheet. FAA date 28 June 2023. Checked by Crosscheck 14 October 2026

For hypothyroidism, the FAA's CACI – Hypothyroidism Worksheet lists levothyroxine sodium (Synthroid, Levothyroid) among its acceptable medications; the others are porcine thyroid (Armour), liothyronine sodium (Cytomel) and liotrix (Thyrolar).

Track your medications
More detail: levothyroxineThe rest of Crosscheck's reading, in plain wordsOpen

The worksheet also asks for a TSH less than 10 within the last year; 10 or higher must be deferred. It applies with all its other criteria, and the examiner must note in Block 60 one of its statements, which include CACI qualified hypothyroidism, and not CACI qualified and deferred.

Show the FAA's words: levothyroxineThe official FAA wording: one passage, each with its document and dateOpen
FAA, CACI – Hypothyroidism Worksheet · FAA date 28 June 2023
CACI - Hypothyroidism Worksheet
Acceptable medications
Levothyroxine sodium (Synthroid, Levothyroid), porcine thyroid (Armour), liothyronine sodium (Cytomel), or liotrix (Thyrolar)
TSH less than 10 (uIU/mL or mlU/L) within the last one year
(10 or higher must be deferred)
AME MUST NOTE in Block 60 one of the following:
CACI qualified hypothyroidism. (Documents do not need to be submitted to the FAA.)
NOT CACI qualified hypothyroidism. I have deferred. (Submit supporting documents.)
Sources and dates: levothyroxineOne FAA document, with the FAA's date and when Crosscheck checked itOpen

See also

  • Hypothyroidism

    Check a condition: what the FAA's documents say the examiner looks at
  • Liothyronine

    Acceptable medication on the FAA's hypothyroidism worksheet
  • Liotrix

    Acceptable medication on the FAA's hypothyroidism worksheet
  • Porcine thyroid

    Acceptable medication on the FAA's hypothyroidism worksheet
  • Other medications

    Every medication in this group, with its answer and wait

Medication guidance alone does not determine whether a pilot is medically qualified to fly. The underlying condition, dosage, side effects, medication combinations, and certification history may affect FAA eligibility.

For informational purposes only. Not legal or medical advice.