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18-May-2010 : Taking too much Viagra can cause illness -- and effects that last longer than desired.

A member of the German rock band, Tokio Hotel, learned these side effects after he took too many of the drug meant to treat erectile dysfunction, Reuters reports.

Sildenafil, sold under the brand name Viagra, relaxes muscles and increases blood flow to certain areas of the body, including the heart and the genitals. Doctors often prescribe it to men to treat impotence.

Tom Kaulitz, 20, told a German newspaper that he felt ill, with a headache and blurry vision, after taking several Viagra tablets.

Someone had offered Kaulitz the pills during his concert tour in Asia and though he initially turned down the offer, he later decided to try one. When he got back to his hotel, he took a few more and felt sick, according to Reuters.

"I popped a few more pills, probably too many," Kaulitz said in a statement. "The next morning my head was pounding and everything in front of my eyes was blurry. It wasn't fun anymore. It was pretty bad."

It took two days for the effects of the pills to wear off. "Unfortunately there were situations where it just wasn't appropriate," Kaulitz said.