If the client weighs 121 lbs and the dantrolene doses is 2.5 mg/kg, the amount of dantrolene needed would be: 2.5mg/kg * 121lb *0.45 kg/lb= 137.2mg
If the dantrolene put on a solution with a concentration of 50 mg/ml, the volume of dantrolene needed would be: 137.2mg/ (50mg/ml)= 2.744ml