The sole objective of this guideline is to summarize and educate about highly useful concepts for scaling up harm reduction in any country.

Estimates of the prevalence of drug use and its consequences have a major influence on many public policies. Estimating prevalence is especially important for forecasting the health needs and costs of the drug user group and for evaluating the coverage and effectiveness of treatment and of harm reduction measures. 

The idea is to monitor health so that we can determine how to improve it. And drug users, above all those who inject, critically need specific actions that not only improve their health but also prevent infections and keep them from being propagated in the population.

Guideline on population size estimates of people who inject drugs and Harm Reduction coverage