Pharmacy and lab economics: scripts, generics, reimbursement and test volume
Why a generic can earn a pharmacy more than a branded medicine, what a reimbursement cut does to a store, and how a lab reaches breakeven.
Industry brief, with a one-minute summary: Pharmacy and diagnosticsKey takeaways
- A pharmacy's profit is gross profit per prescription times the number of prescriptions, plus the front of the store, minus the cost of pharmacists and the store.
- CVS Health's pharmacy and retail segment had revenue of about USD 139.4 billion in 2025 and adjusted operating income of about USD 6.0 billion, a margin of roughly 4 percent.
- Payers reimburse expensive brands close to their cost. Sales value jumps, but gross profit dollars per script do not, and expensive stock also ties up cash.
Key idea
A pharmacy's profit is gross profit per prescription times the number of prescriptions, plus the front of the store, minus the cost of pharmacists and the store. The surprise is that an expensive branded medicine often earns the pharmacy fewer dollars than a cheap generic, because payers pay close to the branded drug's cost. A lab's profit is contribution per test times the number of tests, minus large fixed costs, so it swings sharply with volume and price.
Worked case
Branded or generic: what one store earns, and what a reimbursement cut does
The prompt
Maple Street Pharmacy (a fictional US pharmacy) fills 60,000 prescriptions a year: 90 percent generic and 10 percent branded. A typical generic costs it USD 7 and is reimbursed at USD 25. A typical branded medicine costs USD 985 and is reimbursed at USD 1,000. Each prescription takes about USD 11 of pharmacist and staff time, labels and packaging. What does the store earn from prescriptions before rent and overheads? Then payers cut what they pay for generics by USD 2 each. What happens?
The structure
- Prescription contribution = gross profit per script x scripts, minus the cost of filling them
- Gross profit per script = reimbursement minus the medicine's cost, for generics and for brands
- Yearly gross profit = generic scripts x their gross profit + branded scripts x theirs
- Contribution = yearly gross profit minus filling cost per script x all scripts
- Test the change: lower generic reimbursement, same costs
Working it through
1. Generic gross profit per script
USD 25 paid, USD 7 cost.
Generic gross profit (USD):25 - 7 = 182. Branded gross profit per script
USD 1,000 paid, USD 985 cost.
Branded gross profit (USD):1,000 - 985 = 153. Branded gross margin
USD 15 on a USD 1,000 sale.
Branded gross margin (fraction):15 ÷ 1,000 = 0.0154. Yearly gross profit
54,000 generic scripts at USD 18 and 6,000 branded at USD 15.
Yearly prescription gross profit (USD):54,000 × 18 + 6,000 × 15 = 1,062,0005. Contribution after filling costs
Minus USD 11 for each of 60,000 scripts.
Prescription contribution (USD):1,062,000 - 60,000 × 11 = 402,0006. After a USD 2 cut on generics
Generic gross profit falls to USD 16; nothing else changes.
Contribution after the cut (USD):54,000 × 16 + 6,000 × 15 - 60,000 × 11 = 294,0007. Fall in contribution
The drop as a share of the starting contribution.
Fall in contribution (fraction):(402,000 - 294,000) ÷ 402,000 = 0.2687
The recommendation
Maple Street should treat generic reimbursement as its main profit risk and push volume and services, because a USD 2 cut per generic removes about 27 percent of its prescription contribution, from USD 402,000 to USD 294,000. First, generics bring most of the gross profit dollars even though branded medicines bring most of the sales value. Second, the cost of filling each script does not fall when payers pay less. The risk is that more volume at squeezed rates only adds work. As a next step, add paid services such as vaccinations and move routine refills to cheaper channels such as automated filling or mail order.
Risks: Expensive branded medicines also tie up cash in stock for each unit held; Payers can cut fees again, or steer patients to their own mail-order pharmacies.
CVS Health's pharmacy and retail segment had revenue of about USD 139.4 billion in 2025 and adjusted operating income of about USD 6.0 billion, a margin of roughly 4 percent. Its prescriptions filled rose 5.4 percent on a 30-day equivalent basis, helped by prescription files bought from Rite Aid, but CVS still reported "continued pharmacy reimbursement pressure". More volume at lower pay per script is the pattern of the industry.
CVS Health's Pharmacy and Consumer Wellness segment had revenue of USD 139,367 million and adjusted operating income of USD 6,040 million in 2025. What was the adjusted operating margin, as a decimal? (Round to four decimals.)
Lab economics: fixed costs, volume and price
Worked case
When does a new lab break even, and what does a price cut do?
The prompt
Kaveri Diagnostics (a fictional lab chain in India) opens a central lab in Pune with fixed costs of INR 60 lakh (INR 6,000,000) a month for staff, rent and leased machines. The average patient pays INR 900 for their tests. Reagents, sample collection and transport cost INR 300 per patient. How many patients a month does it need to break even? What is its margin at 14,000 patients a month? A rival cuts prices; if Kaveri cuts its average price by 10 percent, what is its new breakeven?
The structure
- Lab profit = (price per patient minus variable cost per patient) x patients, minus fixed costs
- Contribution per patient = price minus reagents, collection and transport
- Breakeven patients = fixed costs divided by contribution per patient
- Margin = profit divided by revenue at the expected volume
- Test the change: lower price, same costs
Working it through
1. Contribution per patient
INR 900 minus INR 300.
Contribution per patient (INR):900 - 300 = 6002. Breakeven patients a month
INR 6,000,000 of fixed costs over INR 600 each.
Breakeven patients a month:6,000,000 ÷ 600 = 10,0003. Profit at 14,000 patients
14,000 times INR 600, minus fixed costs.
Monthly profit (INR):14,000 × 600 - 6,000,000 = 2,400,0004. Margin at 14,000 patients
Profit over revenue of 14,000 times INR 900.
Margin (fraction):2,400,000 ÷ (14,000 × 900) = 0.19055. Breakeven after a 10 percent price cut
Price falls to INR 810, so contribution falls to INR 510.
New breakeven patients a month:6,000,000 ÷ (900 × 0.9 - 300) = 11,765
The recommendation
Kaveri should not match the price cut across the board, because a 10 percent cut lowers contribution per patient by 15 percent, from INR 600 to INR 510, and raises breakeven from 10,000 to about 11,765 patients a month. First, at 14,000 patients the lab earns a margin of about 19 percent, so it has room, but the cut would need about 2,500 extra patients a month just to stand still. Second, fixed costs do not fall with price. The risk of doing nothing is losing doctors and patients to the cheaper rival. As a next step, offer lower prices only on high-volume bundles (health check packages) and win volume through more collection points and home visits.
Risks: A price war can spread to the most profitable specialist tests; Volume growth needs more collection centres, which add fixed cost.
Quest Diagnostics had revenues of about USD 11,035 million and operating income of about USD 1,556 million in 2025. What was its operating margin, as a decimal? (Round to three decimals.)
An imaging centre in Riyadh runs its MRI scanner 12 hours a day, 26 days a month, at 2 scans an hour when busy. If the scanner is in use 70 percent of the open hours, how many scans does it do in a month?
A pharmacy's sales rose 15 percent because it dispensed more expensive branded medicines, but its profit barely moved. Why?
Sources for this lesson (4)
- Recognized public explanations of case-interview concepts and terms
- Association for Accessible Medicines, "Generic and biosimilar medicines save $467 billion in 2024" (with the IQVIA Institute), September 2025
- CVS Health, fourth quarter and full year 2025 results (Form 8-K exhibit), 10 February 2026
- Quest Diagnostics, fourth quarter and full year 2025 results, 10 February 2026
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