Being part of the Opiate family, it is closely related to drugs like heroin and morphine and therefore can be very addictive. Most users report virtually no pain during or after working out when using between 5 - 10 mg a day. It can be taken subcutaneously, intramuscularly, or intravenously.
Common side effects are sweaty or clammy skin, nausea, vomiting, dizziness, dry bitter tasting mouth, difficult speaking, nervousness, headaches, depression, numbness, itching, blurred vision, high and low blood pressure, and heat flashes. Remember, this is a narcotic and should be used very cautiously.