Sudafed (pseudoephedrine) typically starts working within 15 to 30 minutes, with noticeable relief from nasal congestion usually felt after 30 to 60 minutes. Immediate-release versions provide relief for about 4 to 6 hours, while extended-release versions take about 1 hour to start working but last 12 to 24 hours depending on the formulation.
How Sudafed Works
Sudafed works by narrowing swollen blood vessels in the nose, which helps open nasal passages and ease breathing. This mechanism reduces nasal and sinus congestion caused by colds, allergies, or sinus infections.
Forms and Duration
- Immediate-release tablets or liquids: start working in 15 to 30 minutes, relief lasts 4 to 6 hours
- Extended-release tablets: start working around 1 hour after intake, relief lasts 12 to 24 hours depending on dosage and product
Usage Considerations
- Sudafed is recommended for short-term use, typically no more than 7 days, to avoid side effects.
- It can cause insomnia or jitteriness if taken late in the day.
- Effects include improved nasal breathing within the first hour usually, but specific timing depends on the product type.
In summary, expect Sudafed to begin working in about 15 to 30 minutes with full congestion relief often within an hour for immediate-release forms, while extended-release forms take longer but last significantly longer.
