Fewer than half taking prescriptions
More than a million lives could be saved: claim
Sept. 29 event to showcase pros, cons of drug
Pot, poppers and Viagra common in Brit participants
Three new cases cited
1 in 12 gay men reported infection
Aimed at reducing HIV infection during 'chemsex'
Effort aimed at boosting HIV prevention
Daily use at just 12 percent
Highest number of new and existing cases reported for gay, bisexual men