MUCUS RLF DM ER 600-30 MG TAB

What it is

MUCUS RLF DM ER 600-30 MG TAB is how the CMS NADAC file names this product. The FDA NDC Directory lists it as “guaifenesin, dextromethorphan hbr” and “dextromethorphan hydrobromide, guaifenesin”, as its NDCs’ listings variously write the nonproprietary name, under the trade names “Leader Mucus Relief DM”, “Mucus Relief DM Extended Release Caplets” and “Rugby Mucus Relief DM ER”.

FDA gives its dosage form as tablet, extended release and its route as oral.

Its labelers, the companies named on the label, are Rugby Laboratories and Cardinal Health 110, LLC. dba Leader.

FDA lists it under 3 Established Pharmacologic Classes: Expectorant, Sigma-1 Agonist and Uncompetitive N-methyl-D-aspartate Receptor Antagonist.

The NADAC file of 2026-10-14 prices it under 5 NDCs (National Drug Codes); the FDA directory lists 4 of them.

NADAC classes it as a generic drug (rate-setting class G), and marks it as sold over the counter.

What pharmacies pay

Pharmacies pay $10.68 for 30 tablets (30 × $0.35604 per EA, rounded to the cent), by the CMS NADAC file of 2026-10-14; that price took effect on 2026-09-23. That is what pharmacies pay their suppliers, not what they charge you.

NADAC’s explanation code for it: 1, calculated from the most recently completed pharmacy survey.

What NADAC measures · Why 30 tablets · NADAC explanation codes

All 5 NDCs

• 00536-1161-34 · Rugby Laboratories · $0.35604 per EA · eff. 2026-09-23 filed
• 00536-1161-37 · Rugby Laboratories · $0.35604 per EA · eff. 2026-09-23 filed
• 00536-1161-44 · not listed as a package in the FDA directory · $0.35604 per EA · eff. 2026-09-23 filed
• 00536-1446-34 · Rugby Laboratories · $0.35604 per EA · eff. 2026-09-23 filed
• 70000-0722-01 · Cardinal Health 110, LLC. dba Leader · $0.35604 per EA · eff. 2026-09-23 filed

Other strengths, forms and brands

12 other products in the NADAC file share an FDA nonproprietary name with MUCUS RLF DM ER 600-30 MG TAB.

CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17

Compared with its class

The middle of its 5 NDCs’ NADAC prices is $0.35604 per EA filed.

Of the 68 other products in FDA’s Expectorant class priced per EA, 22 have a higher middle NADAC price and 43 a lower one; 3 have the same. The one in the middle is QC MUCUS RLF COLD-FLU-THRT CPT, at $0.13211 per EA filed (eff. 2026-09-23).

Of the 46 other products in FDA’s Sigma-1 Agonist class priced per EA, 11 have a higher middle NADAC price and 32 a lower one; 3 have the same. The one in the middle is DAYTIME COLD-FLU RELIEF SFTGL, at $0.13116 per EA filed (eff. 2026-09-23).

Of the 46 other products in FDA’s Uncompetitive N-methyl-D-aspartate Receptor Antagonist class priced per EA, 11 have a higher middle NADAC price and 32 a lower one; 3 have the same. The one in the middle is DAYTIME COLD-FLU RELIEF SFTGL, at $0.13116 per EA filed (eff. 2026-09-23).

Prices are compared per unit, whatever the strength or dose, and a class is not a list of substitutes.

CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17

How the class comparison works

What Medicare paid

We don’t know yet; the card above says why.

Which Medicare figure OpenBill compares · How Part D is matched · How Part B is matched

What to ask at the counter

None of these figures is your price: what you pay depends on your pharmacy, your insurance, coupons and discounts.

• What is your cash price for 30 tablets? Is it lower than what I would pay through my insurance?
• It is sold over the counter, so shelf prices vary from store to store: what does it cost per unit here?
• These are questions about price, not medical advice. Do not change or stop a medicine without talking to your prescriber or pharmacist.