 [ Symptoms ] what should i do if i suspect an overdose of afrin nasal spray [ Disease ] this medicine may be harmful if swallowed if swallowing or overdose is suspected contact your local poison control center or emergency room immediately us residents can call the us national poison hotline at 1 800 222 1222 canada residents can call a provincial poison control center symptoms of overdose may include drowsiness slow heartbeat dizziness fainting