Remeron is the most sedating of the antidepressants. So for an elderly person, starting very low in dose is the best way. 7.5mg is a common in the nursing home population. I would stay at that dose for a month. 15mg used to be the starting dose, but for people who have alot of sedation from this drug, the newer 7.5mg might be best to start with, and a week only at this may not be enough. Some people stay on 7.5mg...so go slowly.

Remeron is used alot because it stimulates appetite which can be poor in the elderly also. So don't be surprised at weight gain.

Remeron can affect the blood system, so make sure your dad gets monitored for that.