An authorized generic of Mucinex was sold before, but it isn’t sold now. Ask your pharmacist whether a regular generic (guaifenesin) is available.
Source: FDA, updated October 30, 2026
How to pay the least
Ask for the cash price
Generic guaifenesin ER
No pharmacy we check posts a price for guaifenesin ER 600 mg, 30 tablets. Pharmacies pay about $8.22 for 30 tablets; cash prices are higher. Ask two or three.
- Ask your pharmacy: “What’s your cash price for generic guaifenesin ER 600 mg, 30 tablets?”Find pharmacies near you
- Ask one or two other pharmacies too. Cash prices for the same generic can differ a lot from store to store.
Sold without a prescription The same guaifenesin ER 600 mg is sold over the counter, no prescription needed (Mucinex and store brands). Ask your pharmacist or prescriber whether it would do for you.
A regular generic has the same active ingredient as Mucinex, and the FDA requires it to work the same way.
Compare every option
Question
Brand nameMucinex
Authorized genericguaifenesin
Regular genericguaifenesin
What you’d pay
Cash priceAsk the pharmacyUsually the highest price
Not soldNo longer sold
At least$8.22for 30 tablets; pharmacies pay this
Same as Mucinex?
The original
–
Same active ingredientFillers and dyes can differ
Details for each option
Details for
Brand nameNo maker’s card
We didn’t find a savings card or cash price from Mucinex’s maker. Ask the pharmacy for Mucinex’s cash price. With insurance, ask what your plan charges.
Authorized genericNot sold now
Regular genericAsk the pharmacy
Generic guaifenesin is sold. Ask the pharmacy for its cash price. With insurance, ask what your plan charges.
What it’s used for
What the FDA label says
Uses
- helps loosen phlegm (mucus) and thin bronchial secretions to rid the bronchial passageways of bothersome mucus and make coughs more productive
Source: the FDA label for Mucinex (Reckitt Benckiser LLC), May 27, 2026. Full label on DailyMed
Prices change: confirm with the pharmacy before you fill. drugalt.com/drug/mucinex/