INDIANAPOLIS -- A popular, relatively new birth control pill is the subject of several television ads from attorneys that ask people to come forward if they have suffered side effects.

The controversy involves Yaz, a contraceptive taken by mouth that has been on the market since 2006, 6News' Sarah Cornell reported.

When it came out, the label listed very few side effects, and that's partially the reason law firms, including Ken Nunn, are pursuing legal action.

Attorneys are actively gathering clients to sue Bayer, the manufacturer of Yaz, claiming that the company neglected to list side effects, such as blood clots, stroke, heart attack and possible death.

Dr. Marguerite Sheperd, a gynecologist at the Indiana University Medical Center for 28 years, said she's concerned about the ad campaigns and their effect on patients.

"It's not only confusing, it's frightening," Sheperd said. "I would shudder to think what happened if she were driving along and hearing some media report saying this pill causes blood clots and heart attacks, etcetera, and then she doesn't pick up her prescription and we're back to square one."

Joanna Dardo said reports of possible side effects and consultation with a friend caused her not to get the pill, which had been prescribed to her.

"It made her severely depressed and suicidal, and so that kind of put me off on taking the medicine," Dardo said.

Sheperd said the side effects of Yaz are no different than any other birth control pill, and they're not enough to keep her from prescribing the medication.

As long as doctors are prescribing Yaz, many trusting patients will keep taking it.

"I usually just go by what the doctor says and how it's going to benefit me, versus what it says it's going to do to me," said patient Taylor Nisely.

The makers of Yaz eventually aired an advertisement that clearly stated the drug's potential side effects.

Attorney Ken Nunn told 6News that his ad that asks women to contact him has only been airing since Monday and that about a dozen women had already come forward.