Message Number: YG5401 | New FHL Archives Search
Date: 2001-07-11 18:05:00 UTC
Subject: Re: Dr. Williams, am I doing the math correctly?

In a message dated 07/11/01 4:08:58 AM Eastern Daylight Time, writes:

"...chlorythromycin (Biaxin) at 50 mg/kg once daily, and
at 35 mg/kg once daily, or 20 mg/kg twice daily..."

Ferret weighs 2.38 (decimal) pounds = 5.236kg (pounds x 2.2= kg)

Biaxin suspension dispensed at 250mg per 5ml
Amoxi suspension dispensed at 50mg per 1ml

35mg x 5.23kg = 183.26mg amoxi once daily, which is 3.67cc of the

50mg x 5.23kg = 261.8mg Biaxin once daily, which is 5.24cc of the

Sounds like an awful lot to me... am I doing something wrong?

Yup, that would be an awful lot. Your mistake is a common one, in
conversion of pounds to kilograms. One kilogram equals 2.2 pounds.
So your
2.38 pound ferret would be a little over one kilogram. When you
look at it
that way, you'd end up giving about 25 mg Amoxi (or a half a ml)
twice a day
- I tend to prefer it at twice a day, because the slighly lower dose
tends to
cause less stomach upset and even out the blood levels better), and
just over
50 mg (or one ml) Biaxin daily. Sorry I don't have the exact
amounts - I
don't have a calculator handy.

Dr. Ruth
Save lives - spay or neuter your pet.