Pseudoephedrine

Examples: Sudafed Congestion. Check the exact formulation on your label.

What it is useful for

Can reduce congestion. It does not shorten the illness or treat its cause.

Availability: US nonprescription; sold behind the pharmacy counter

When to expect a difference

Initial effect

Short-term relief; timing depends on formulation.

Full benefit

No single reliable time applies.

Use period

Use the shortest needed time, according to the label.

Stop or ask

Stop and call a clinician if not improving within 7 days, or if fever occurs.

How to use it

• Do not use with an MAO inhibitor or within 14 days of stopping one.
• Check the strength and release type. Do not crush extended-release tablets.

Use the dose on your specific package. Different concentrations and release types are not interchangeable.

Possible downsides

Insomnia, Restlessness, Fast or irregular heartbeat.

Check suitability

Check allergies, health conditions and all other medicines before use. The finder can flag common restrictions, but it is not a complete interaction checker.

Pregnancy, breastfeeding, children, immune suppression and postoperative care are outside this finder.