OTTAWA, Jan 17 (Reuters) - Canada's study into whether to approve Merck & Co Inc's COVID-19 oral antiviral treatment "is moving more slowly", federal Health Minister Jean-Yves Duclos said on Monday.

"There are some specific issues for this medication," Duclos told reporters after Ottawa approved an oral antiviral treatment by Pfizer Inc, but did not give details. In its pivotal clinical trial, Merck's pill had less impressive results than the one produced by Pfizer. (Reporting by David Ljunggren)