Don't go out alone in Wan Chai - you could be in for a big surprise

If you are thinking of having a few beers in Wan Chai tonight, you'd better remember to keep an eye on your drink - revellers have been drugged and robbed in recent weeks.

Since the start of the year four men have contacted the Sunday Morning Post to say their drinks were spiked while they were downing a few in Hong Kong's notorious nightlife hub. Over the past five weeks, three expatriates and a tourist said it happened to them. They would only speak anonymously about their ordeals.

One man was awoken - lying in the street in Causeway Bay - by police in the early hours of the morning. He had been robbed of all his cash. His last memory was of drinking in Neptune 2 nightclub in Wan Chai.

Another man woke in an alleyway in Wan Chai to find his iPhone stolen. He had been drinking in the Bridge bar, but had no memory of what happened in between.

The other two men can only remember drinking in Wan Chai and then waking up at home with total memory loss - they also had been drinking in Neptune 2 and the Bridge. One lost all the money in his wallet while the other had his iPhone stolen. Only cash and iPhones were taken and not their credit cards.

All four men had blackouts and were still feeling the ill-effects of whatever they had been drugged with 24 hours later. They had been in places that sex workers frequent.

From 2004 to 2007, Wan Chai police recorded 44 theft cases in which the victims (mostly foreign nationals) were approached by sex workers while they were having drinks in bars, but there was no evidence that drugs had been involved. Since 2008, toxicology tests confirmed the presence of drugs in three theft cases. But the problem is that victims do not report it.