Pharmacy calculations aren't one problem. They're 10. Most students are only fixing one
When a student tells me they're bad at calculations, I ask them to show me their work on a problem they got wrong. Almost every time, the issue isn't what they think it is.
There are 10 distinct failure points in pharmacy calculations:
Unit conversion failure — wrong conversion factor, or skipping a conversion entirely
Formula misuse — plugging numbers into the wrong formula or misremembering the formula
Setup breakdown — correct pieces, wrong arrangement before the math even starts
Concentration/dilution confusion — mixing up mg/mL, percent strength, ratio strength, or which volume is which
Flow-rate/infusion errors — misidentifying what's being solved for: mL/hr vs drops/min vs total infusion time
Alligation errors — not knowing when to use it, or setting up the grid incorrectly
Answer-sense failure — getting an answer and not recognizing it's impossible (100 mL/hr vs 1000 mL/hr, for example)
Time-pressure breakdown — knows the material, falls apart on a timed exam
Weak checking habit — no verification step, errors that would have been caught with a second pass
Study-process failure — practicing answers instead of practicing the setup
Most students who think they have a "calculations problem" actually have 2-3 specific problems from this list. The other 7-8 are fine.
Studying more calculations without knowing which of these is breaking down is like taking more of the wrong medication. The effort is real. The outcome won't be.
The first thing I do with every student is identify their actual failure pattern before touching content. Everything else follows from that.
Happy to answer questions in the comments.