First, can you tell me why you are giving one? And to treat what?
Where did you get the penicillin? Do you know how much to give?
What kind of penicillin is it? Brand name and strength?
Thanks for the info.
Most colds in cats are viral infections, so antibiotics won't have any effect. They are usually self limiting and resolve within a week as long as it doesn't get complicated or turn into pneumonia. Is she eating/drinking ok? Is she acting lethargic?
Penicillin can be given in the muscle and sometimes as a subcutaneous injection. Have you ever given an injection in the muscle before? If you don't feel comfortable doing it, I wouldn't.
Also, there are other causes of the symptoms you described including allergies, asthma, and feline heartworm disease.
Well... if it is a virus the penicillin won't help.
You can give the injection by picking up the skin between the shoulders and making a tent.., sticking the needle through the skin into the space between the skin and the muscle... pull back on the plunger to make sure you don't get blood, and then inject into the space just under the skin... If you get a lot of resistance on injection, you are probably either still stuck in the skin or in the muscle underneath. Most pets don't mind the injection, but it can sometimes sting. I like to rub the area afterwards so that they don't get a lump or knot. That is made to give daily. You can give 1/4 child's dose of benadryl every 12 hours if there is any sneezing or congestion. Try tempting her with meat flavored baby foods to keep her appetite up. When cats get colds and they get congested, their nose might get stopped up, and they rely on their sense of smell to eat... besides possibly having a fever, that's why many of them stop eating, so offering things like meat flavored baby foods that are very aromatic will help.