| phase ii clinical trial | (n) a clinical trial on more persons than in phase I; intended to evaluate the efficacy of a treatment for the condition it is intended to treat; possible side effects are monitored, Syn. phase II |
| phase iii clinical trial | (n) a large clinical trial of a treatment or drug that in phase I and phase II has been shown to be efficacious with tolerable side effects; after successful conclusion of these clinical trials it will receive formal approval from the FDA, Syn. phase III |