Hydromorphone can be given SQ or IM, and respiratory depression does occur at high doses.
- Ambros B et al (2009) Antinociceptive effects of epidural administration of hydromorphone in conscious cats. Am J Vet Res 70(10):1187-1192
- Robertson SA et al (2009) Antinociceptive and side-effects of hydromorphone after subcutaneous administration in cats. J Feline Med Surg 11(2):76-81