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Asfotase alfa

Enzyme
Other names: Strensiq

FAA guidance

Acceptable with conditions.

Wait

48 hours

after the first dose

Different waits apply in other cases.

Source: FAA, MedGuide (FAA Office of Aerospace Medicine medication reference). FAA date 1 October 2026. Checked by Crosscheck 14 October 2026

The FAA's MedGuide lists asfotase alfa (Strensiq) as allowed, for hypophosphatasia, with a wait of 48 hours after the first dose and 4 hours after each dose and the same after the final dose, used as prescribed.

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More detail: asfotase alfaThe rest of Crosscheck's reading, in plain wordsOpen

Wait

  • 4 hours after each dose
  • 4 hours after the final dose

The MedGuide defines allowed as acceptable for use while performing flight or safety-related duties, provided the condition is stable/aeromedically acceptable and no adverse side effects are present, and says wait times are not determined solely by the medication: an extended observation period may be required to verify clinical stability of the condition.

  • 48 hours after the first dose: ground observation
  • 4 hours after each dose: ground observation
  • 4 hours after stopping: ground observation
Show the FAA's words: asfotase alfaThe official FAA wording: three passages, each with its document and dateOpen
FAA, MedGuide (FAA Office of Aerospace Medicine medication reference) · FAA date 1 October 2026
Generic: asfotase alfa
Brand Name: Strensiq
Drug Class: Enzyme
Underlying Condition: HYPOphosphatasia
Use: ALLOW
INITIAL Wait Time (after first dose): 48 hours
SUBSEQUENT Dose Wait Time (after each dose): 4 hours
DISCONTINUATION Wait Time (after final dose): Same as subsequent dose wait time
Frequency Use Limit: As prescribed
FAA, MedGuide (FAA Office of Aerospace Medicine medication reference) · FAA date 1 October 2026
ALLOWED: The medication is acceptable for use while performing flight or safety-related duties, provided the condition is stable/aeromedically acceptable and no adverse side effects are present.
FAA, MedGuide (FAA Office of Aerospace Medicine medication reference) · FAA date 1 October 2026
Underlying Condition: Evaluating medication use requires considering the impact of safety of flight from both the medication and underlying condition. Wait times are not determined solely by the medication; an extended observation period may be required to verify clinical stability of the condition.
Sources and dates: asfotase alfaOne FAA document, with the FAA's date and when Crosscheck checked itOpen

See also

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.