What is the maximum dose of Mucinex (guaifenesin) that can be taken at one time?

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Last updated: September 15, 2026 • View editorial policy

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Maximum Single Dose of Mucinex

The maximum dose of Mucinex (guaifenesin extended-release) that can be taken at one time is 1200 mg (two 600 mg tablets). 1

Dosing Guidelines

According to the FDA-approved labeling for Mucinex extended-release tablets 1:

  • Adults and children ≥12 years: 1 or 2 extended-release tablets (600-1200 mg) every 12 hours
  • Maximum single dose: 2 tablets (1200 mg)
  • Maximum daily dose: 4 tablets (2400 mg) in 24 hours
  • Children <12 years: Do not use

Administration Instructions

The extended-release formulation requires specific handling 1:

  • Do not crush, chew, or break the tablets (this would destroy the extended-release mechanism)
  • Take with a full glass of water
  • Can be taken without regard to meals

Clinical Context

The 1200 mg single dose represents the upper limit for immediate administration. This extended-release formulation was specifically designed to provide 12-hour symptom relief while maintaining bioequivalence to immediate-release formulations that required dosing every 4 hours 2. The bi-layer tablet technology allows for both immediate and extended drug release, eliminating the need for more frequent dosing.

Important caveat: While 1200 mg is the maximum single dose, starting with 600 mg (one tablet) may be appropriate for initial therapy, with escalation to 1200 mg if needed for symptom control. The flexible dosing range allows titration based on individual response 3.

References

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Professional Medical Disclaimer

This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.