What the Cold & Flu LiquiCaps contain
The manufacturer lists acetaminophen for pain and fever, dextromethorphan as a cough suppressant and doxylamine as an antihistamine. This describes the named US Cold & Flu LiquiCaps product, not every NyQuil product or every country’s formulation. Check the Drug Facts on your own package. [1]
PURE Zzzs is a different product family
The inspected ZzzQuil PURE Zzzs Complete Sleep page lists melatonin alongside L-theanine, GABA, ashwagandha and magnesium. That combination should not be inferred from a NyQuil label, and the ingredient list is not proof that the blend is right for a particular sleep problem. [2][3]
Compare active ingredients rather than the bedtime wording
Imagine a person says they took the nighttime Vicks product. Ask for the exact name and label before discussing ingredients or adding another product. A cold medicine and a melatonin-containing supplement answer different questions; neither should be identified by package color alone. [1][2]
| Named product | Ingredient distinction |
|---|---|
| NyQuil Cold & Flu LiquiCaps | Acetaminophen, dextromethorphan, doxylamine |
| PURE Zzzs Complete Sleep | Melatonin-containing supplement blend |
Sources for this article
- NyQuil Cold & Flu Nighttime Relief LiquiCaps | Vicks
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product. - PURE Zzzs 10mg Melatonin‡ Complete Sleep Capsules | ZzzQuil
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product. - Dietary Supplements: What You Need to Know
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.