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Oncor Guaifenesin 100 mg / 5 mL Expectorant Cough Syrup - 16 fl oz | Robitussin

$12.99

Bulk discount rates

  • Buy 2 pay only $8.49 each
  • Buy 3+ pay only $7.33 each

Expiration Date: 11-2026 or better


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UPC:
383720503168
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Description

Oncor Guaifenesin Liquid – 100 mg per 5 mL (16 fl oz) | Sugar-Free Chest Congestion Relief

Oncor Guaifenesin Liquid is a cherry-flavored expectorant that provides effective relief from chest congestion. Each 5 mL dose contains 100 mg of guaifenesin to help loosen mucus and thin bronchial secretions, making coughs more productive and breathing easier.

This sugar-free, alcohol-free guaifenesin syrup is made in the USA and safe for adults and children. It’s ideal for relieving congestion due to colds, bronchitis, or allergies—without added dyes, menthol, or dextromethorphan (DM).

Looking for cold medicine without dextromethorphan? Learn more in our guide to guaifenesin-only cold medicine without DM.

Expiration Date: 11/2026 or better

Compare to: Mucinex® and Robitussin® Chest Congestion syrup — same guaifenesin 100 mg/5 mL strength, sugar-free and alcohol-free, at a lower price.


What Will I Receive?

  • 1 bottle of Oncor Guaifenesin Liquid – 16 fl oz
  • Total: 16 fl oz of guaifenesin oral solution
  • Expiration Date: 11/2026 or better
  • Factory-sealed bottle with tamper-evident foil under cap

Buying for a household or clinic? Multi-pack options qualify for free shipping and offer better value per ounce.

Want to Stock Up and Save?

We also offer Oncor guaifenesin syrup in multi-packs for even better value:

Key Features

  • 100 mg guaifenesin per 5 mL – helps clear mucus and phlegm
  • Loosens chest congestion and thins bronchial secretions
  • Cherry flavor – easier to take than bitter alternatives
  • Sugar-free and alcohol-free – gentle enough for daily use
  • Safe for adults and children (see dosage instructions below)

Directions

  • Adults & Children 12+ years: 2 to 4 teaspoonfuls every 4 hours
  • Children 6 to under 12: 1 to 2 teaspoonfuls every 4 hours
  • Children 2 to under 6: ½ to 1 teaspoonful every 4 hours
  • Children under 2: Consult a doctor
  • Do not exceed 6 doses in 24 hours

Active Ingredient (per 5 mL)

  • Guaifenesin 100 mg – Expectorant

Inactive Ingredients

Citric Acid, Cherry Flavor, FD&C Red No. 40, Glycerin, Propylene Glycol, Purified Water, Sodium Benzoate, Sodium Citrate, Sorbitol Solution, Sucralose.

Warnings

  • Consult a doctor before use if you have a persistent cough, asthma, or excessive mucus
  • Stop use and ask a doctor if cough lasts more than 7 days or is accompanied by fever, rash, or persistent headache
  • If pregnant or breastfeeding, consult a healthcare provider before use
  • Keep out of reach of children

Storage

  • Store at 20–25°C (68–77°F)
  • Do not use if foil seal under cap is broken or missing

Frequently Asked Questions

Does this product contain dextromethorphan (DM) or menthol?

No. Oncor Guaifenesin contains only guaifenesin as the active ingredient. It does not include dextromethorphan (DM), menthol, sugar, or alcohol.

Is Oncor Guaifenesin safe for children?

Yes, this product can be used for children over 2 years old. Dosage should follow the label instructions or a doctor’s recommendation.

How often can I take Oncor Guaifenesin?

The typical dosage is every 4 hours, up to 6 doses in 24 hours. Always follow the directions on the label or consult your healthcare provider.

Do I need a prescription to buy Oncor Guaifenesin?

No. Oncor Guaifenesin is available over the counter and does not require a prescription.

Expiration Date:
11-2026

Need a cold medicine that includes a cough suppressant? Browse our full cold & flu collection for more options.

Frequently Asked Questions

What is guaifenesin used for?

Guaifenesin is an expectorant that helps loosen mucus and phlegm in the airways. It makes coughs more productive and is commonly used to relieve chest congestion due to colds, flu, or bronchitis.

Is Oncor the same as Mucinex or Robitussin?

Yes, Oncor Liquid Guaifenesin contains the same active ingredient (100 mg/5 mL guaifenesin) as Mucinex® Liquid and Robitussin® Chest Congestion syrup. It does not contain dextromethorphan (DM), so it's a guaifenesin-only option.

Does Oncor contain dextromethorphan (DM)?

No. Oncor is a guaifenesin-only syrup. If you're looking for cold medicine without DM, this is a great option. Read our full guide here.

Is Oncor safe for people with high blood pressure?

Yes. Oncor does not contain pseudoephedrine or other decongestants that may affect blood pressure. It's sugar-free, alcohol-free, and dye-free — ideal for sensitive users.

How often can I take Oncor?

Adults and children 12 years and older can take 10 mL every 4 hours. Do not exceed 6 doses in 24 hours. Always follow package instructions or consult your healthcare provider.