 [ Symptoms ] does vicks inhaler contain any antihistamine [ Disease ] a vasoconstrictor classified as a category i inhalant decongestant is the drug propyl hexedrine inhalers also contain substances such as menthol eucalyptol and camphor although their effectiveness as decongestants has not been substantiated relief from congestion occurs between 30 seconds to 5 minutes and persists for 30 to 120 minutes following two inhalations the inhalers retain their effectiveness for 2 to 3 months vicks inhaler comes under this category hence it does not contain antihistamine