Safe Human drugs that you can give dogs and how much but you should always check with your vet.
Safe Humane Drugs & Doses
Buffered Aspirin Pain Relief, anti-inflammatory 5mg per lb.large breed every 12hr
Vitamin B Appetite Stimulant 1/2 ml to 2 ml subcutaneously every 24 hours
Benadryl allergies and itching 1/2ml per lb. every 8 hours (max dose 2 mg per lb.)
Dramamine motion sickness up to 50ml every 8 hours
Hydrogen Peroxide3% Induces vomitting 10ml by mouth every 15 minutes
Epinephrine1:1000 medication reactions, insect bites and stings 1/10ml to 1/2ml intramuscular or subcutaneously
Pepto Bismol Diarrhea, vomitting and anti-gas 1 tsp per 5 lbs every 6 hours
Di Gel Liquid antacid and anti-gas up to 4 Tbls every 8 hours
Mineral Oil eliminates constipation up to 4 Tbls Daily
Kaopectate Diarrhea 1 ml per lb. every 2 hours
Amoxicillin Bacterial infection 5mg per lb every 12 hours
Ampicillan Bacterial infection 10 mg per lb every 6 hours
Tetracycline Bacterial infection 10 mg per lb. every 8 hours
PEN BP-48 Bacterial Infection 1cc per 20 lbs subcutaneously
Penicillan300,000 units/mil Bacterial Infection 1 ml per 30 obs subcutaneously
Not on the above list but can be useful: Tums for upset tummies and added Calcium.