How Long Does It Take For Pseudoephedrine To Wear Off?
How Long Does It Take For Pseudoephedrine To Wear Off? Sudafed can start working within 30 minutes. Immediate-release forms of Sudafed can begin to wear off after four to six hours. Extended-release versions of Sudafed last longer, so you don’t have to take it as frequently. How long do the effects of pseudoephedrine last? Absorption: