We check this website, now merckmanual.nl is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is merckmanual Down Right Now? - NO! merckmanual is up!
If you have problem with access to site merckmanual, and domain merckmanual.nl is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).