least effective dose

例句：

1. 1. The drug's least effective dose is 0.5 mg per day.
   该药物的最小有效剂量为每天0.5毫克。
2. 2.The study found that the least effective dose of the medication was 10 mg.
   研究发现，该药物的最小有效剂量为10毫克。
3. 3. The doctor prescribed a less potent version of the drug for her condition.
   医生为她的状况开了一种效力较弱的药物版本。