A Canadian law firm has filled its array of class-action lawsuits against the maker of Bayer's popularly prescribed oral contraceptives Yaz and Yasmin, alleging that the drug resulted in serious health complications for some of the women who took it, without any adequate warnings.

The pills, sold under the tag Yaz and Yasmin, are taken by thousands of Canadian women and teens. For most, they post positive results.

However, some users have revealed to experience racing hearts, strokes and, in some cases, gallbladder problems leading to surgery.

The drug was approved for sale in Canada several years ago.

Among those filling the suit is Christine Lovelace. The Halifax woman revealed to develop strange symptoms, after she began taking Yaz last February.

In addition, she told to suffer from heart palpitations, waking up in the middle of the night with her heart racing, and unusual menstrual changes, with periods lasting as long as 14 days.

"I guess I am trying to raise awareness that if you have all these strange symptoms complications and you don't feel right, talk to your doctor," she quotes.