Final answer:
To calculate the number of milligrams of painkiller that should be prescribed every 4-6 hours, multiply the patient's weight in kilograms by the prescribed dosage.
Step-by-step explanation:
To calculate the number of milligrams of painkiller that should be prescribed every 4-6 hours, we need to calculate the patient's weight in kilograms and then multiply it by the dosage prescribed. First, we convert the patient's weight from pounds to kilograms:
155 lb * (1 kg/2.205 lb) = 70.3 kg
Next, we multiply the patient's weight in kilograms by the prescribed dosage:
Dosage = 7.00 mg/kg * 70.3 kg = 491.1 mg
Therefore, the patient should be prescribed 491.1 mg of painkiller every 4-6 hours.