OTTAWA - Health Canada says Apotex Inc. will be recalling 11 additional lots of Alysena-28 birth control pills as a precautionary measure.

Apotex is making the additional recall while it investigates why one lot — LF01899A — of the product contained packages with extra placebo pills in place of active pills.

Packages of Alysena-28 should have three rows of the pink active pills and only one row of white placebo pills.

Canadians using this product should use a non-hormonal method of birth control, contact their health care provider for medical advice and return unopened packages to their pharmacist.

Alysena-21, which is manufactured at the same facility, is not part of the current recall as these packages don't normally include a row of the placebo pills.

However, because the product is made in the same facility, Health Canada and Apotex are working together to verify this product as well.

In the meantime, Canadians are encouraged to check to make sure their packages of Alysena-21 contain three rows of pink pills.

Consumers are also strongly encouraged to report any medical problems associated with the use of Alysena-28 or Alysena-21 to Health Canada.

The specific lots involved in the new recall are: LF01901A, LF01980A, LF02037A, LF01900A, LF01982A, LF01981A, LF02026A, LF01898A, LF02036A, LF01894B, and LF01979A.

Related on HuffPost:

A picture of what Alysena-28 should look like, with three rows of pink (active) pills and only one row of white (placebo) pills. From alysena28

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  • Timing

    Pills work best if they're taken at the same time each day -- which is often difficult for women to remember.<br> (Photo courtesy of <a href="" target="_hplink">Flickr/canardo</a>)

  • Taking Antibiotics

    It's not as common as it once was, but antibiotics can occasionally affect the effectiveness of your birth control pill. Ask the doctor who prescribed the antibiotics about any potential interactions.<br> (Photo courtesy of <a href="" target="_hplink">Flickr/Sheep purple</a>)

  • Talking About It With Partner

    While it can be difficult with a new partner, avoiding the subject of birth control won't make it go away, particularly if you've already started having sex. Get past sexual histories, concerns and preferred methods out in the open as soon as possible to make this work for everyone.

  • Buying The Wrong Condoms

    Besides also being more comfortable for both partners, ensuring you have the right condom size can mean it's less slightly to break (if it's too tight) or slip off (if it's too small).<br> (Photo courtesy of <a href="" target="_hplink">Flickr/robertelyov</a>)

  • Be Open To Change

    The Pill isn't the be all and end all of birth control options - investigate alternatives if you're not all that into the Pill, or if it's giving you some adverse side effects. Options like the intrauterine device (IUD) shown here are quite common, and could even be more effective.<br> (Photo courtesy of <a href="" target="_hplink">Flickr/+mara</a>)

  • Consistency

    Forgetting to take their Pill is more common than most women would like to admit, and it can certainly impact the risk of pregnancy. Missing one day is generally believed to be fine, but you should probably opt for back-up for a week after just in case.<br> (Photo courtesy of <a href="" target="_hplink">Flickr/Shemer</a>)

  • Adding On Protection

    Similarly, the first week -- and more cautious people say even month -- of starting the Pill, use a condom, as the hormones won't yet be as effective as they could be. <br>(Photo courtesy of <a href="" target="_hplink">Flickr/Jenny Lee Silver</a>)

  • Using The Wrong Tools

    Oil-based lubricants shouldn't be used with condoms, as they can break down the latex and therefore increase the risk of pregnancy. Always opt for water-based lubricants.

  • You Take It Out Too Soon

    For birth control methods like sponges and diaphragms that require removal, women can make the mistake of taking them out too soon -- each should be removed six hours after sex, but shouldn't be kept in any longer than 30 hours.<br> (Photo courtesy of <a href="" target="_hplink">Flickr/Ryan Somma</a>)