Try to keep the victim calm. If an overdose is suspected, try to prevent the victim from taking more drugs. Treat the victim for signs of shock if necessary. Signs include weakness , bluish lips and fingernails , clammy skin , paleness , and decreasing alertness. If the victim is having convulsions , give convulsion, first aid .
Some drugs can cause violent and unpredictable behavior.
Get professional help. DO NOT offer your opinions when offering assistance. You don't need to know why drugs were taken to give first aid. DO NOT try to reason with someone who is on drugs. Do not expect them to behave reasonably.