04/08/2015 04:06 EDT | Updated 06/08/2015 05:59 EDT

Alesse 21 birth control pills recalled in Western Canada

Shoppers Drug Mart has recalled one lot of Alesse 21 birth control pills, according to Health Canada, which advises consumers to check expiry dates.

The recall applies to consumers in British Columbia, Alberta, Saskatchewan and Manitoba who purchased or used Alesse 21, lot G73720, between March 16 and April 1 of this year. The lot had an expiry date of September 2014, which could make them less effective.

The regulator advises consumers to:

- Verify the lot number and expiry date of all medications.

- Return unused affected product to your pharmacist for a replacement.

- Speak to your health-care practitioner if you have used any of the affected product and consider using a non-hormonal method of birth control (such as condoms, spermicidal foam or gel) until another oral contraceptive is obtained.

Health Canada said it's monitoring the recall and how Shoppers Drug Mart implements "appropriate corrective and preventative actions."

The department asked consumers to report any adverse events.

Shoppers Drug Mart said it is reviewing its practices.