Did you ever wonder about those disclaimers on the end of commercials for prescription medications like Cialis?  Sometimes they use up half of the air time.  South Texas College of Law Professor Gerald Treece says they're on there for two reasons.

“In some cases, the FDA requires it,” professor Treece says.  “But, in other cases, that gives them some protection in the event anyone sues them.”

The commercials work.  Dr. Eugene Boisaubin at UT Health McGovern Center says people come into his office asking about the drugs being advertised.

“I really carefully listen to see whether it's valid,” says the doctor, “but then I say, no, you're not going to get the drug unless I can test you.”

He says low testosterone is very rare.  You're probably just tired.

Dr. Boisaubin says patients do need to know about possible side effects.  “But, to be really honest,” he says, “the primary reason drug companies do them is for liability protection.”

And, Professor Treece says he doesn’t know if anybody actually hears those warnings.

“We've got to the point, because warnings are so prevalent for everything,” he says, “that no one takes anything seriously.”