I get really congested due to year round allergies. i can't tolerate the decongestants. could i try a child's dose to see if it would help?

Avoid decongestants: In general, decongestants are not really effective long-term therapies for allergies. Generally, the effects of decongestants are to constrict blood vessels, throughout the body, which really does nothing to treat the causative problem, which is inflammation related to the allergen. Antihistamines, nasal steroids, allergen avoidance, and leukotriene antagonists are more effective.