About 80% of all AIDS cases that occur in regions like Eastern Europe and Central Asia are due to injection drug uses like heroin etc. Although much of this couldn’t be prevented till date, now there is some hope of preventing an occurrence of AIDS in these individuals.
A Bangkok based study revealed that use of anti-HIV medications by injection drug users can almost half the risk of acquiring AIDS. Previously such prophylaxis showed some promise in men practicing sex with same-sex individuals and also in those practising heterosexual relationships.
This is a remarkable advancement towards AIDS prevention.
Please cross check information from other sources too. For all your health concerns please be guided by your healthcare provider. References- http://www.nlm.nih.gov/medlineplus/news/fullstory_137771.html