Sept 12 (Reuters) - Merck (NYSE:MRK) & Co Inc MRK.N :
* Now available in Canada: Isentress HD (raltegravir), a new once-daily option, in combination with other antiretroviral agents, for the treatment of HIV-1 infection in appropriate patients
* Availability of Isentress HD, a new 1200 mg once-daily dose of company's integrase strand transfer inhibitor, Isentress