i was going over shock therapy Article ,i just want to double check im following it correctly .Here is the section

Azuim and Dexamethasone:
Give 2.5 mg per pound of body weight. This means, if you have a 42 LB dog (42 x 2.5 = 105 mg). You would then check the bottle to get the strength of the solution you are using. The bottle may be 2 mg per ml, 3 mg per ml, or 4 mg per ml. Suppose you have the 2 mg strength you would have to inject 52.5 ml in order to give 105 mg of the drug; if you have the 4 mg strength you would only need to inject 26.25 ml to give 105 mg of the drug. You see, the strength (%) of the bottle tells you how many milligrams (mg) of drug in each 1 ml of the drug.

so lets use a 36 lb dog

36x2.5=90mg......with a 2 mg/ml bottle =45 ml ....3mg/ml =30ml.....4mg/ml =22.5ml

now an ml is the same as a cc, correct?
the reason i feel im doing something wrong is cause 45 cc seems like a huge dosage. also can i put an Antibiotics in the same i.v bag that has the dex in it. If so what Antibiotics do you suggest