January Annals review by J Hom:
Do decongestants, antihistamines, and nasal irrigation relieve the symptoms of sinusitis in children?
no proven benefits of decongestants, antihistamines, or nasal irrigation in kids with sinusitis
risks of oversedation, anticholinergic symptoms, and tachyarrhythmias are likely to exceed any potential benefits
culprits include: pseudoephedrine, diphenhydramine, dextromethorphan
bacterial cause accounts for only 0.5-2.2% of all sinusitis