Withdrawal symptoms include severe anxiety, insomnia, profuse sweating, muscle spasms, chills, shivering, tremors, and can occur four to five hours after last dose. The acute symptoms reach peak intensity after about 36 to 72 hours and are usually over within 7 to 10 days. It may be 6 months or longer before total recovery from withdrawal occurs. Users may respond to pain of withdrawal by taking another dose, without realizing they have become addicted. Legal Status In Canada, heroin and other narcotic analgesics are governed by the Narcotic Control Act.
Unlawful possession is a criminal offense.