Randomized "how many tablets" problems built from real oral strengths: metoprolol, levothyroxine, furosemide, metformin and more. Easy keeps the numbers whole, Standard brings in half tablets where the tablet is scored, and Hard hides a mg-mcg or g-mg conversion in the order.
Divide the ordered dose (D) by the strength of one tablet (H) and multiply by the quantity (Q), which for tablets is 1. Order 0.15 mg of levothyroxine with 75 mcg tablets: convert first, 0.15 mg = 150 mcg, then 150 ÷ 75 × 1 = 2 tablets. Only scored tablets may be halved.
Before you divide, check that the order and the label use the same unit. If one says mg and the other mcg, convert first. Everything else on a tablet problem is simple division, which is exactly why the conversion is where the marks go.
| Order | Setup | Answer |
|---|---|---|
| Furosemide 80 mg; 40 mg tablets | 80 ÷ 40 × 1 | 2 tablets |
| Metoprolol tartrate 25 mg; 50 mg scored tablets | 25 ÷ 50 × 1 | ½ tablet |
| Levothyroxine 0.15 mg; 75 mcg tablets | 150 mcg ÷ 75 × 1 | 2 tablets |
| Acetaminophen 1 g; 500 mg tablets | 1,000 mg ÷ 500 × 1 | 2 tablets |
| Carvedilol 25 mg; 12.5 mg tablets | 25 ÷ 12.5 × 1 | 2 tablets |
A tablet can be split only if it is scored, meaning it has a line pressed into it for breaking. Even then, many programs teach that you round to the nearest half tablet at most. Capsules are never split. Extended-release, enteric-coated and sublingual tablets are not split or crushed, because that changes how the drug is released.
On an exam, a calculated answer like 1.5 tablets for an unscored tablet is a signal, not an answer. In practice it means calling pharmacy for a different strength. The practice tool only asks for half tablets when the stem says the tablets are scored, and you can switch half tablets off in the rounding settings if your school never allows them.
Most oral doses come out to one or two tablets, because manufacturers make strengths that match common doses. Many instructors teach students to stop and recheck any answer above three tablets. It is not a rule, but a dose of 8 tablets or 0.1 tablet almost always means a missed conversion: mg read as mcg, or grams left as grams.
The conversion to watch is mg and mcg, because both appear on real orders. Levothyroxine and digoxin are often written either way. Moving from mg to mcg multiplies by 1,000, so the number gets bigger. Moving from mcg to mg divides by 1,000, so it gets smaller. Write the leading zero on any dose below 1 (0.125 mg, never .125 mg), and never add a trailing zero (5 mg, never 5.0 mg). Both mistakes have caused tenfold dosing errors.
Divide the ordered dose by the strength of one tablet: Desired ÷ Have × 1. Convert both to the same unit first. An order of 80 mg with 40 mg tablets is 80 ÷ 40 = 2 tablets.
Only if the tablet is scored and your program and facility allow it. Capsules, extended-release and enteric-coated tablets are never split. If the math gives a fraction of an unscored tablet, the right move is to ask pharmacy for another strength.
There is no fixed limit, but most oral doses work out to one or two tablets. Many instructors teach students to recheck any answer above three tablets, because it usually means a missed unit conversion.
Multiply mg by 1,000 to get mcg, or divide mcg by 1,000 to get mg. 0.15 mg is 150 mcg, and 125 mcg is 0.125 mg. Convert before you divide.