Expectorant (OTC)Generally Approved

Guaifenesin

Brand names: Mucinex, Robitussin|Last verified: 2026-03-01

FAA Pathway: Generally acceptable — consider underlying illness

Guaifenesin is an expectorant generally acceptable for pilots. It has no sedating properties when used alone. However, many combination products contain additional ingredients (dextromethorphan, antihistamines) that may affect flying.

Check your medications

Look up any medication in our FAA compatibility database.

Medication Checker

Related Resources

Pilot Tip

Always report all medications on your FAA medical application (Form 8500-8, Item 17a), even OTC medications. Failure to disclose is a far bigger issue than the medication itself.

Certification Details

Key Requirements

Use single-ingredient product only

Certificate Classes

All classes eligible

Caution

Avoid combination products containing sedating ingredients

Notes

If illness requires expectorant, consider if safe to fly at all

Sources

FAA OTC Medication Guide

Last verified: 2026-03-01

Frequently Asked Questions

Is Guaifenesin allowed for pilots?

The FAA considers Guaifenesin (Mucinex, Robitussin) to be "Generally Approved" for medical certification purposes. Guaifenesin is an expectorant generally acceptable for pilots. It has no sedating properties when used alone. However, many combination products contain additional ingredients (dextromethorphan, antihistamines) that may affect flying.

What is the FAA status of Guaifenesin?

Guaifenesin has a status of "Generally Approved" under FAA medical certification policy. The certification pathway is: Generally acceptable — consider underlying illness.

Can I fly while taking Guaifenesin?

Guaifenesin is generally compatible with flying. However, you must report it on your FAA medical application (Form 8500-8) and ensure you are not experiencing side effects that could impair flight safety. Always consult your Aviation Medical Examiner (AME).

Important Notice

The FAA does not publish a comprehensive list of “approved” medications. The information on this page represents our interpretation of publicly available FAA guidance and is provided for informational and educational purposes only. It does not constitute medical advice, legal advice, or a guarantee of certification outcome.

The primary issue with the FAA is always whether the underlying medical condition — not just the medication — is compatible with safe flight. You should only start, stop, or change medications after consulting your treating physician. Always consult with a qualified Aviation Medical Examiner (AME) for guidance specific to your situation. FAA policies are subject to change. ClearedMed is not affiliated with or endorsed by the FAA.