 [ Symptoms ] how can you get rid of fever blisters fast i have a big fever blister on my top lip and another one coming up beside it how can i get rid of them fast [ Disease ] if overdose is suspected contact a 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 severe drowsiness seizures widened pupils in children mentalmood changes such as restlessness irritability hallucinations may occur before drowsiness