“Drug safety assessed in human volunteers and in a battery of nonclinical studies in healthy rabbits and non-human primates showed no evidence of toxicity at the maximum proposed, single therapeutic dose of intravenous raxibacumab to be administered to human adults of 40 mg/kg.”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗
Why that species
Target is a bacterial toxin; rabbit and cynomolgus macaque are the inhalation anthrax efficacy models
“several drug efficacy studies of raxibacumab with and without antibiotic in inhalation anthrax animal models (NZW rabbit and cynomolgus macaque)”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗
Surrogate molecule
No surrogate; the clinical antibody was tested in cynomolgus monkeys and rabbits
“Healthy cynomolgus macaques administered 3 intravenous doses or 3 subcutaneous doses of 40 mg/kg raxibacumab once every 12 days”
“Drug safety assessed in human volunteers and in a battery of nonclinical studies in healthy rabbits and non-human primates showed no evidence of toxicity at the maximum proposed, single therapeutic dose of intravenous raxibacumab to be administered to human adults of 40 mg/kg.”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗
Species: DART
New Zealand White rabbit (embryo-fetal development only)
“A single embryonic-fetal development study was conducted in pregnant, healthy New Zealand White rabbits administered two intravenous doses of raxibacumab up to 120 mg/kg (three times the human dose on a mg/kg basis) on gestation days 7 and 14.”
✓ VerifiedFDA pharmacology/toxicology review, p. 7Source ↗
Species: carcinogenicity
Not conducted
“Carcinogenicity, genotoxicity, and fertility studies have not been conducted with raxibacumab.”
No surrogate used; raxibacumab itself tested in healthy cynomolgus macaques
“Healthy cynomolgus macaques administered 3 intravenous doses or 3 subcutaneous doses of 40 mg/kg raxibacumab once every 12 days, or a single intramuscular dose (40 mg/kg) of raxibacumab, showed no adverse effects, including no effects up to 120 days post-dosing.”