Cheryl, thanks for your question.
Metacam (meloxicam) is used off label for exotic pets such as guinea pigs, rats and the like. Likewise, there are always associated risks. For domestic animals, cats and dogs, renal conditions can be a concern. This can be the same for exotics. For this reason, and because of his lethargy, I would advise contacting the veterinarian that rx'd this medication and to speak with him first. If he is unavailable or the clinic is closed, seek an exam to be done by a veterinarian that feels comfortable seeing exotics. An overdose of this magnitude can be life threatening. I wish you the best of luck in getting your companion the care he needs.
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Veterinary Nurse
8 yrs experience with animals, 3 in emergency med. Owner of 3 APBT and 3 sphynx