Skip to content
Chemist Prices

Guaifenesin: Price, Dosage & Where to Buy

Written by Trish Greenhalgh, MBChB, MD, FRCP, FRCGP · Last updated

Guaifenesin is tracked on this site as a drug. Status on file: Pharmacy medicine (P) - ask the pharmacist.

This hub brings together reference details and legal purchase options in one place. In the United Kingdom, Guaifenesin is sold over the counter.

Manufacturing status is reviewed periodically, so check the summary below rather than relying on memory. Read on for dosage forms, region detail and frequently asked questions.

Facts

Active ingredient
Guaifenesin
Pharmacy medicine (P) - ask the pharmacist
Licensing status not on file

No generic version on file

Guaifenesin price estimates, the UK-licensed equivalent

Estimate, not a quote

  • 100mg/5ml Pharmacy medicine (P) - ask the pharmacist

    £7.12 per pack dispensed

    N/A

    Price estimate

    Where to buy
All forms and prices
Price estimates by strength
Forms Price per unit
100mg/5ml £7.12 / pack dispensed

as of Jul 1, 2026 · Pricing methodology

Treat any price here as an estimate, based on public UK pricing references such as the NHS Drug Tariff, not an offer from any particular seller. Actual prices vary by pharmacy, pack and location, so confirm the exact price with the pharmacy before you buy. A price that seems oddly cheap next to this range should raise a red flag for an unlicensed or unsafe seller.

This medicine is available without a prescription: general sale list medicines are sold off the shelf, and pharmacy medicines are supplied after a quick word with the pharmacist.

Guaifenesin is sold as a general sale list medicine in the UK. Read the pack leaflet first before buying, and ask the pharmacy team if anything is unclear. Some pack sizes of this product are kept behind the pharmacy counter and supplied by the pharmacist, so check with staff if it is not on the open shelf.

About Guaifenesin

Guaifenesin is an expectorant used to help loosen mucus in the airways, making chest secretions easier to clear. It is not assigned a pharmacological class or ATC classification in the product details. Its United Kingdom prescription status, available strengths, forms and generic availability are not specified, so a pharmacist can confirm the appropriate product and supply arrangements.

What Guaifenesin is used for

Guaifenesin is commonly used as an expectorant for chest congestion associated with mucus in the airways. It helps loosen and thin respiratory secretions, which may make mucus easier to clear through coughing.

The product details do not specify particular diagnosed conditions, age groups or symptom combinations for use. A pharmacist can advise whether a guaifenesin product is suitable for the symptoms present, particularly when symptoms are persistent, severe or accompanied by other concerns.

Dosage from the label

The label lists no available strengths or dosage forms. The label lists no dosing schedule for adults or children. Because the product details do not specify a strength, formulation or indication-specific regimen, a pharmacist should confirm the relevant instructions for the particular guaifenesin product.

Dosing can differ between formulations, so the container labelling should be checked carefully. The label does not provide a missed-dose schedule or dose adjustments for particular health conditions.

How Guaifenesin works

Guaifenesin is generally understood to act as an expectorant. It helps increase the water content and volume of secretions in the respiratory tract, making thick mucus less sticky. This can make mucus easier to move and clear when coughing.

The effect is directed at mucus clearance rather than directly stopping the cough reflex. The product details do not assign guaifenesin a formal pharmacological class or an ATC classification.

Main interactions

  • No drug interactions are listed
  • No food interactions are listed
  • A pharmacist can check other medicines before supply

Key warnings

  • No product-specific warnings are listed
  • No contraindications are listed
  • A pharmacist can confirm suitability when product details are incomplete

Pregnancy and breastfeeding

The label does not specify pregnancy or lactation data for guaifenesin. Anyone who is pregnant, planning pregnancy or breastfeeding should discuss use with a doctor or pharmacist before choosing a product.

Missed dose

The product details do not specify a missed-dose schedule for guaifenesin. If a dose is missed, standard pharmacy advice is to follow the instructions for the particular formulation and avoid taking extra doses to compensate. A pharmacist can advise when the strength and dosing schedule are not stated.

Storage

No storage conditions are listed for this product. Keep the particular guaifenesin product in its original packaging, protected from moisture and excessive heat, and follow the container instructions to maintain quality.

Pharmacies by area for Guaifenesin (UK-licensed equivalent)

Pharmacies near you

Use your location to open the pharmacies closest to you and ask them about Guaifenesin, the UK-licensed medicine with the same active ingredient.

Find pharmacies near me

Cities with the most pharmacies

Related medicines

Frequently asked questions

What is guaifenesin used for?

Guaifenesin is commonly used as an expectorant for chest congestion involving mucus in the airways. It helps loosen respiratory secretions so they can be cleared more easily.

Does guaifenesin require a prescription in the United Kingdom?

The prescription status for this product is not specified. Ask a pharmacist in the United Kingdom whether the particular guaifenesin product requires a prescription and whether it is suitable.

Where is Guaifenesin sold?

Browse the geography section to find a location near you and ask them about Guaifenesin. Availability is not guaranteed at any single pharmacy, so call ahead.

First published October 2, 2026 · Last updated · Report an error on this page