Pseudoephedrine can potentially interact with several other medicines (see Drug Interactions With Pseudoephedrine).
An overdose with pseudoephedrine can cause serious problems. If you happen to overdose on this medication, seek immediate medical attention.
(Click Sudafed Overdose for more information.)
Pseudoephedrine should be stored at room temperature, away from moisture and heat. Keep this and all other medications out of the reach of children.
For people who take this medication on a regular schedule, take your missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue with your regular schedule. Do not take a double dose of pseudoephedrine.