Mucinex can be taken as follows:

• Immediate release formulation: 200 to 400 mg orally every 4 hours as needed, not to exceed 2.4 grams per day.
• Sustained release (extended-release) formulation: 600 to 1200 mg orally every 12 hours, not to exceed 2.4 grams per day.

For Mucinex DM (which contains an additional cough suppressant), the usual dose is 1 to 2 tablets every 12 hours, not exceeding 4 tablets per day. It is important to follow the dosing instructions on the package or those given by a doctor, and not to take more than the recommended amount or for longer than recommended. Drink plenty of fluids while taking Mucinex to help loosen congestion and soothe the throat. Avoid taking multiple products containing the same drug simultaneously to prevent overdose. These guidelines apply to adults and children over 12 years; dosing for children varies and is usually lower, and in some cases not recommended for young children. Always consult a healthcare professional if symptoms persist or worsen after several days of use.