 [ Symptoms ] i have the flu over and over again its been 3 years [ Disease ] it depends on which products you are using over the counter otc products have directions on the label with age specific dosage instructions as well as uses warnings and possible side effects and storage information decongestant ointments and sprays can cause rebound nasal congestion if used for an extended period of time if you ever have questions about over the counter medications be sure to ask your pharmacist