A Family Member In Germany Has Been In A Sleep,

A family member in Germany has been in a sleep, non functioning condition on its after having been given Novalginas a pain killer. He wakes briefly then sleeps and barely recognizes his wife. This has happened for 3 days already. The Germans dr. In charge told my sister in law , patients' wife, that if he doesn't come out of this in a few days he may die. Is this a common happening with people receive this drug? I understand it's banned in the USA.
8 p.m. EST