Names of any Meds for appetite stimulant alone or with an antidepressant?

89 yr old father is losing weight, not well and refusing to eat. Wants to die & crying. Dr. only has him on 25 mg of Zoloft an I think the dose could go up maybe? Also I’ve asked about possibility of an appetite stimulate? Any med like that available alone or in combo w/antidepressant? Thank you!