Abuse and misuse of OTC nasal decongestant propylhexedrine can lead to serious harm such as heart and mental health problems. Some of these complications, which include fast or abnormal heart rhythm, high blood pressure, and paranoia, can lead to hospitalization, disability, or death.

http://www.fda.gov/safety/medical-product-safety-information/benzedrex-propylhexedrine-drug-safety-communication-fda-warns-abuse-and-misuse-nasal-decongestant