A 38-year-old man with a 12-year history of heroin use presents to the de-addiction clinic. He reports daily use and has attempted cessation multiple times without success. Which is the most common route of administration among opioid users in India?

Explanation

## Most Common Route of Opioid Administration in India **Key Point:** Intravenous injection is the most common and predominant route of heroin administration among opioid-dependent individuals in India, particularly in urban settings and among organized drug-using networks. ### Epidemiological Context India has a significant opioid use disorder burden, with heroin being the primary drug of abuse. The intravenous route is preferred because: - Rapid onset of action (within seconds) - Intense euphoric effect - Lower dose requirement for desired effect - Cost-effectiveness per unit high achieved ### Routes and Their Prevalence | Route | Prevalence | Onset | Intensity | Risk Profile | |-------|-----------|-------|-----------|---------------| | Intravenous | Most common (60–75%) | Seconds | Highest | Highest (bloodborne infections, abscess, endocarditis) | | Smoking | Common (15–25%) | Minutes | High | Respiratory complications | | Intranasal | Emerging (5–10%) | 5–10 min | Moderate | Lower infection risk | | Oral | Least common (<5%) | 30–60 min | Lowest | Lowest physical risk | **High-Yield:** IV heroin use is associated with the highest risk of: - HIV and Hepatitis C transmission (shared needles) - Bacterial endocarditis - Septic thrombophlebitis - Abscesses and cellulitis - Overdose mortality **Clinical Pearl:** The shift toward intranasal and smoking routes has been observed in some Western countries as harm-reduction awareness increases, but IV remains dominant in India due to entrenched drug-using practices and cost considerations. **Warning:** Do not confuse "most common route" with "safest route." IV is most common but carries the highest morbidity and mortality risk.