Will beconase (beclomethasone) side effects die down?

Maybe. Most common side-effect is irritation of nasal lining. This can be minimized by orienting the nozzle toward the ear on the same side as the nostril, i.e. Spray out, away from septum, toward ear on same side. The spray then falls on the "turbinates, " 3 folds on the outer wall of the nose halfway between the nostril and the ear that swell to block the passage and make mucus to cause post-nasal drip.