Health Canada says eight valsartan medications are being added to the initial recall for drugs used to treat high blood pressure and heart failure.
The recall expansion is for medications that may contain a potential carcinogen known as NDMA which the agency says can cause cancer with long-term exposure.
The initial recall was announced last month of 28 valsartan medications and Health Canada says all of the recalled products use an ingredient manufactured by Zhejiang Huahai Pharmaceuticals in China.
The product names of the medications recalled include Teva-Valsartan, Act-Valsartan, Sandoz Valsartan, Sanis Valsartan, Pro Doc Limitee Valsartan and Sivem Pharmaceutical ULC Valsartan.
Health Canada says anyone taking the affected drugs should contact their health-care provider.
Patients are advised to continue to take their medications unless they have been told to stop by their health-care provider.