What Is Delsym XR? Uses, Dosage, and What You Need to Know in 2026

Delsym XR is one of the most recognized cough medicines in America — but many patients aren't entirely sure what's in it, how it works, or whether it's the right choice for their cough. This guide covers everything you need to know about Delsym XR in plain English.

What Is Delsym XR?

Delsym XR is the brand name for dextromethorphan polistirex extended-release oral suspension — an over-the-counter cough suppressant (antitussive) manufactured by RB Health (US) LLC, a subsidiary of Reckitt Benckiser. It is available in grape and orange flavors in 3 fl oz and 5 fl oz bottles.

The "XR" stands for "extended release." What sets Delsym apart from standard cough syrups is its unique time-release formula: each dose provides up to 12 hours of cough suppression, compared to 4 to 8 hours for most OTC cough medicines.

What Is Delsym XR Used For?

Delsym XR is indicated for the temporary relief of cough due to minor throat and bronchial irritation — the kind that commonly occurs with:

• Common cold
• Flu (influenza)
• Inhaled irritants (dust, smoke, allergens)
• Post-viral cough (the lingering dry cough after a cold)

It is specifically designed for dry, nonproductive cough — a cough that does not bring up mucus. If your cough is wet and productive with significant phlegm, Delsym XR may not be the right choice. An expectorant like guaifenesin (Mucinex) or a combination product may be more appropriate.

Delsym XR should not be used for chronic cough from asthma, emphysema, or smoking. These require different treatment approaches.

Active Ingredient

The active ingredient in Delsym XR is dextromethorphan polistirex, providing dextromethorphan at a concentration equivalent to 30 mg of dextromethorphan HBr per 5 mL (teaspoon). The polistirex formulation binds the dextromethorphan to an ion-exchange resin polymer, which releases the drug slowly in the gastrointestinal tract over approximately 12 hours.

Delsym XR Dosage: Adults and Children

Always use the measuring cup provided with the bottle — do not use a household spoon. Shake the bottle well before each use.

• Adults and children 12 years and older: 10 mL (60 mg DXM equivalent) every 12 hours. Maximum: 20 mL (120 mg) in 24 hours.
• Children ages 6 to under 12: 5 mL (30 mg) every 12 hours. Maximum: 10 mL (60 mg) in 24 hours.
• Children ages 4 to under 6: 2.5 mL (15 mg) every 12 hours. Maximum: 5 mL (30 mg) in 24 hours.
• Children under 4 years: Do not use. Not approved and can cause serious harm.

How Long Should You Take Delsym XR?

Delsym XR is intended for short-term use only — no more than 7 days. Stop taking it and contact a healthcare provider if:

• Your cough lasts more than 7 days
• Your cough comes back after stopping
• Your cough is accompanied by a fever, rash, or persistent headache

Key Facts About Delsym XR

• OTC status: Available without a prescription
• Controlled substance: No — dextromethorphan is not DEA-scheduled
• Contains alcohol: No — Delsym is alcohol-free
• Contains sulfites: No — Delsym is sulfite-free
• Suitable for: Adults and children ages 4 and older
• Avoid if: You take an MAOI antidepressant — dangerous interaction risk

Want to understand more deeply how Delsym XR works in the body? See: How Does Delsym XR Work? Mechanism of Action Explained.

If you're having trouble finding Delsym XR at your pharmacy, medfinder can help you locate it in stock near you.