Q1. How many milligrams are equal to 1/150 grains?
Answer: 1 grain is equal to 65 mg therefore:
1/150 grains will contain:
= (1 x 65)/150 = 0.43 mg
Q2. How many 975 mg tablets of aspirin are required to prepare 100 tablets of 1 grain?
Answer: 100 tablets of 1grain of Aspirin contains: 100 x 65 = 6500 mg of Aspirin.
The number of 975 mg tablets of Aspirin:
= 6500/975 = 6.66 = 7 tablets
Q3. If 3 capsules of 150 mg of Clindamycin are added to 150 cc of 1% Cleocin topical solution, what is the % of Clindamycin in the final mixture?
Answer: 1 % 150 cc Cleocin solution contains:
= (150 x 1)/100 = 1.5 gm Clindamycin
The addition of 3 capsules each weighing 150mg will result in: 1.5 gm+ 0.45 gm = 1.95 gm
% of Clindamycin in final mixture would be:
= (1.95 x 100)/150 = 1.3%
Q4. How many milliosmols/L are representated by 1000 cc 0.9% sodium chloride?
Answer: 307.7
Q5. How many milliosmols per liter are representated by a 50 cc 50% sodium bicarbonate solution? [mw = 84 gm/mole]
Answer: 11904
Q6. What is the pH of a solution having a ratio of ionized to unionized species of drugs of 1 x 10^-6? [PKa = 7]
Answer: pH = pKa + log [salt/acid]
pH = 7 + log[ 10^-6]
= 7 - 6
= 1
Q7. The adult dose ofa drug is 500 mg. What is the dose for a 2 year old child? [use young rule]
Answer: Young rule = age in year/(age + 12) x adult dose
= 2/(12+2) x 500 = 71.42 mg
Q8. Calculate the dose for a 3-year old child. An adult dose of the drug is 500 mg. [use young rule]
Answer: Young rule = age in year/(age + 12) x adult dose
= 3/(12+3) x 500 = 100 mg,
Q9. What is the % of acetic acid in 1 in 50 solution?
Answer: 2%
Q10. The usual initial dose of chlorambucil is 150 ug/kg of body weight once a day. How many milligrams should be administered to a person weighing 154 lb?
Answer: We know, 150 ug = 0.15 mg & 1 kg = 2.2 lb;
Thus, 2.2 lb/154 lb = 0.15 mg/ X mg
X = 10.5 mg
Q11. If the dose of a drug is 200 mg, how many doses are contained in 10 g?
Answer: 10 g = 10,000 mg
Number of doses 10,000 (mg)/200 (mg) = 50 doses.
Q12. If 1 tablespoon is prescribed as the dose, approximately how many doses will be contained in 1 pint of the medicine?
Answer:
1 tablespoon = 15 mL
1 pint = 473 mL
Number of doses = 473 mL/15 mL = 31.5 or 31 doses.
Q13. How many drops would be prescribed in each dose of a liquid medicine if 15 mL contained 60 doses? [The dispensing dropper calibrates 32 drops/mL]
Answer:
15 mL = 15 x 32 drops = 480 drops
Size of dose = 480 (drops)/60 = 8 drops.
Q14. It takes approximately 4 g of ointment to cover an adult patient’s leg. If a physician prescribes an ointment for a patient with total leg eczema to be applied twice a day for 1 week, which of the following product sizes should be dispensed: 15 g, 30 g, or 60 g?
Answer:
Number of doses 2 per day x 7 days = 14
Size of dose = 4 g
Total quantity 14 x 4 g = 56 g; thus, 60 g product size.
Q15. If a preparation contains 5 g of a drug in 500 mL, how many grams are contained in each tablespoonful dose?
Answer:
1 tablespoonful = 15 mL
500 (mL)/15 (mL) = 5 (g)/X
X = 0.15 g.
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