Nyquil Sleep Onset Timeline: How Fast It Works and When It Peaks
| Active Ingredient | Standard Dose (30 mL) | Peak Concentration Window | Elimination Half-Life |
|---|---|---|---|
| Doxylamine Succinate | 12.5 mg | 2, 4 hours | 10, 12 hours |
| Acetaminophen | 650 mg | 0.5, 1.5 hours | 2, 3 hours |
| Dextromethorphan HBr | 30 mg | 2, 2.5 hours | 3, 6 hours |
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does nyquil make you sleepy