A drug has a half-life of 4 hours. If 2 gms are given every 4 hrs what will be the amount in gms in the body immediately after the third dose?

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1. 

   Angelok890

   2 gm at 0 hr, at 4 hrs 1/2 from first injection is one, leaving 1 gm in the body and you inject 2 more for a total after the second injection of 3. At the third dose, 1/2 of 3 is gone, leaving 1.5 gms, you inject 2 more for a total of 3.5 immediately after the third dose

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