Applying Category Management: A Case Study of Relief Medical Store

Most retailers learn category management as a textbook concept first and only later face the harder question: how do you actually apply it to your own shelves, your own data, and your own monthly bills? A medicine store is one of the most demanding places to attempt this. Stock ranges from antibiotics to vitamins to first-aid items, margins vary widely across these groups, and physical space is always tight. This post walks through how a medical store can move from theory to practice, using its own sales and stock records to decide what to stock, what to expand, and what to quietly let go.

What category management means for a medicine store 🔗

Category management is a structured way of treating each group of related products as a small business in its own right, rather than managing thousands of items one by one. It is a shared process of evaluating and managing categories as strategic business units, with the aim of growing the whole category rather than pushing a single brand. The method was first developed by Brian Harris in the late 1980s, and his 1997 eight-step model has since become the accepted industry standard for designing profitable, customer-first categories.

For a medical store, a “category” might be something broad like respiratory care, while sub-categories underneath it could be cough syrups, inhalers, and nasal sprays. The key principle is that grouping should follow how customers actually buy, not how the wholesaler invoices the items. The definition should reflect customer behaviour, not warehouse logic – a customer treating a cold thinks of syrup, lozenges, and a decongestant together, even if those arrive from three different distributors.

Using your own sales and stock data 🔗

The first real obstacle most stores hit is not understanding the theory but turning their existing records into something useful. A medicine store already sits on a goldmine: daily billing data, purchase invoices, and stock-on-hand figures. The challenge is converting these raw numbers into a category analysis that points to genuine growth opportunities.

The starting point is to arrange your products into a clear hierarchy. When a retail business begins, it sets up a merchandise hierarchy that groups products into departments, categories, classes, and sub-classes. A store can choose to apply the analysis at a broad department level or drill further down into narrower groups. For a pharmacy, a workable structure could look like this:

Once items are organised this way, you can pull sales value, units sold, and current stock for each group over a fixed period such as the last quarter or year. Past sales data lets you predict demand more accurately and estimate how many units to allocate to each part of the store. The goal at this stage is not perfection but a reliable picture of which groups are pulling their weight and which are sitting idle on the shelf.

Calculating each sub-category’s share 🔗

A practical and revealing step is to measure how much each sub-sub-category contributes within its parent category. The simplest method is to total the product varieties and sales within a group and express each part as a percentage of the whole.

The share calculation, step by step 🔗

Suppose your “Vitamins and Supplements” category contains three sub-sub-categories. You first total their combined sales, then divide each one by that total. If multivitamins sell ₹60,000, calcium supplements sell ₹25,000, and protein powders sell ₹15,000 in a month, the category total is ₹1,00,000. Multivitamins therefore hold a 60% share, calcium 25%, and protein 15%. The same method works if you count the number of distinct product varieties (SKUs) instead of sales value.

This share figure matters because it shows where the category’s strength really lies. A sub-group with a small share but a large number of varieties may be over-stocked and fragmenting your shelf, while a sub-group with a large share from very few varieties may deserve more depth. Accurate category definition is crucial because it shapes the scope of management effort and influences every strategy that follows. Getting the share calculation right early prevents you from chasing the wrong products later.

Deciding which medicine groups to focus on 🔗

The central strategic question is which sub-categories deserve more attention to lift both sales and profit. Volume alone is a misleading guide. A fast-selling group with razor-thin margins can earn less than a slower group with healthy margins. To judge fairly, retailers combine margin and inventory efficiency into a single measure called Gross Margin Return on Investment, or GMROI.

Why GMROI beats looking at sales alone 🔗

GMROI measures how efficiently a retailer converts its inventory investment into gross margin, and is calculated by dividing gross margin by the average inventory cost. The reading is easy to interpret: a value above 1.0 means the store earns more in gross margin than it spends holding the stock, while a value below 1.0 signals that the inventory is not generating enough return.

This is especially useful for a medicine store because different groups behave very differently. A product with a 65% margin that turns over once a year delivers a far lower GMROI than a product with a 30% margin that turns over eight times a year. A store might assume its high-margin specialty medicines are its best performers, only to discover that everyday items like pain relievers or antacids – modest margins but rapid, repeat sales – actually generate more profit per rupee of stock. GMROI is what separates winning categories from losing ones, and it can be applied as broadly or as narrowly as you need.

The strategic takeaway is straightforward. Sub-categories with a strong GMROI are candidates for more depth, better placement, and reliable reordering. Those languishing well below 1.0 are candidates for trimming. GMROI improves when you raise gross margin, reduce average inventory cost, or tighten the assortment by removing chronic underperformers – all moves directly within a store owner’s control.

A pharmacy-specific lens: ABC and VED 🔗

Medicine retail has its own well-established companion tools that work alongside category analysis. In a study of a large teaching hospital pharmacy in Chandigarh, an ABC analysis found that roughly 13.78% of items accounted for nearly 70% of the annual drug expenditure, meaning a small slice of products tied up most of the money. VED analysis adds a clinical layer by grading items as Vital, Essential, or Desirable. The lesson for any medical store is that a handful of high-value, vital items demand the tightest control, while a long tail of low-value items can be managed far more loosely.

Overheads and the space constraint 🔗

No stocking decision is complete without weighing what it costs to run the store every month. For a typical medicine store, the major overheads are rent for the premises, staff salaries, electricity (including refrigeration for temperature-sensitive drugs), licensing and compliance costs, and software or billing-system fees. These fixed costs do not disappear whether a shelf earns money or not, which is why every square foot of selling space carries a hidden monthly rent.

Treating shelf space as a scarce asset 🔗

This is where physical space becomes a decisive factor in category decisions. Space is finite and expensive, so each category effectively competes for it. Because 70% to 80% of a retailer’s assets are typically tied up in inventory, measuring how profitable that inventory is becomes essential rather than optional. A category that delivers a strong GMROI earns the right to more visible, accessible shelf space, while a weak one should be reduced so the freed space can host a better performer.

It also helps to look beyond gross margin to the fuller cost picture. A more complete measure, sometimes called Net Return on Inventory, subtracts operating expenses like rent, salaries, and utilities from the margin before judging a category. A sub-category may look healthy on margin alone yet barely cover its share of the overheads once that floor space is accounted for. Bringing rent and salary into the analysis turns category management from a shelf-arranging exercise into a genuine profit-planning tool.

Bringing it together for the store 🔗

The path from theory to practice for a medicine store follows a clear loop. Organise products into a sensible hierarchy, pull your existing sales and stock data, calculate each sub-category’s share to see where strength lies, measure GMROI to judge true profitability, and then reallocate shelf space toward winners while accounting for monthly overheads. Retailers who complete this full review cycle consistently outperform those who stop at implementation, because the review step catches shifts in buying behaviour before they turn into revenue problems. For a single store, this is not a one-time project but a habit – revisited each quarter as seasons, prescriptions, and customer needs change.

What do you think? If you ran a small medicine store, would you trust GMROI enough to shrink a high-selling but low-margin section to make room for a quieter, more profitable one? And how would you balance pure profitability against the duty to always keep vital, life-saving medicines in stock even when they earn very little?

References

1. https://nielseniq.com/global/en/insights/analysis/2024/exploring-category-management-processes-steps-and-business-benefits-for-a-win-win-win-approach/
2. https://www.relexsolutions.com/resources/category-management/
3. https://www.fieldpie.com/blog/category-management-in-retail/
4. https://www.retaildogma.com/category-management/
5. https://www.shopify.com/blog/gmroi
6. https://www.zycus.com/blog/category-management/stages-of-category-management-process
7. https://umbrex.com/resources/industry-analyses/how-to-analyze-a-retail-company/retailer-gross-margin-return-on-investment-gmroi/
8. https://www.toolio.com/post/the-complete-guide-to-gmroi-for-retail-brands
9. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3021698/