RISUG is an injectable compound that partially blocks the vasa deferentia (tubes that carry sperm), providing effective contraception for up to 10 years per dose.

It is effective immediately, has few side effects, and has proven to be reversible.

This contraceptive has completed Phase I and Phase II clinical trials in India.

The third stage of trials on humans is going on in Delhi, Ludhiana, Udhampur, Jodhpur and Kharagpur.

The inventor

S K Guha looks exactly like one of the absent-minded science wizards we often hear about but rarely meet.

A biomedical engineer, Guha was born in Patna in 1939. He did his graduation and masters in electrical engineering from IIT Kharagpur. Image: The Indian Institute of Technology, Kharagpur. Also read: Young Indians who make a difference

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