The Hidden Cost of Inventory Imbalance

Is your Inventory Strategy Costing you more than you Realize?

The goal in the pharmaceutical supply chain sounds simple: having the right medication, in the right place, at the right time. In reality, achieving this balance is complex. Too little inventory puts service levels at risk, while too much increases return exposure, dating risk, and carrying costs. In this article, we explore why inventory balance matters for both wholesalers and manufacturers, highlight the key pressures each side faces, and outline practical considerations for managing inventory more effectively across the supply chain.

Finding the right balance of Inventory

Sitting between the manufacturers that produce medications and the providers and patients who rely on that medication are pharmaceutical wholesalers. Wholesalers play a vital role in the healthcare supply chain, ensuring pharmaceutical products are available where and when they are needed. That responsibility makes inventory management critical because having the right product in the right place at the right time directly supports patient care and the stability of the entire supply chain.

Finding the right inventory balance is a constant balancing act. Wholesalers should maintain sufficient inventory to prevent stockouts and protect service levels, while remaining mindful of capital constraints and financial risk. At the same time, manufacturers share responsibility by managing production plans, supporting commercial and marketing strategies, and meeting sales goals. As demand patterns shift and economic pressures increase, having too much or too little inventory can quickly create challenges- making it essential for wholesalers and manufacturers to work together to manage inventory strategically across the ecosystem.

Why Inventory Matters for Wholesalers and Manufacturers

Manufacturer Point of View

For manufacturers, inventory sitting at the wholesaler serves as the primary connection to the end customer. Wholesaler inventory allows mutual customers to place frequent, often daily, orders and adjust quickly as demand changes. Without the right level of inventory in the channel, service and product access can suffer.

Key considerations for manufacturers include:

• Production scheduling: Manufacturers rely on forecasts to plan future production runs accurately.
• Wholesaler availability: Distributor inventory supports consistent product availability and customer access.
• Sales performance: Quarterly and annual sales goals can influence end-of-period buying behavior.
• Return risk: Excess inventory at the wholesaler can increase the likelihood of large returns.
• Product dating: Products that sit too long on wholesale shelves risk becoming short-dated.

Wholesaler Point of View

From a wholesaler’s perspective, inventory represents a significant investment. Large amounts of capital are tied up in inventory, which naturally highlights how much inventory is on hand and where opportunities exist to free up capital.

Key considerations for wholesalers include:

• Days of Inventory on Hand (DIOH)- measures how many days a business can continue to meet demand using its current inventory levels, assuming no additional replenishment.
• Cost of capital: The financial resources tied up in inventory to ensure product availability across the supply chain, impacting cash flow and limiting how much money can be used for other business needs.
• Forecast: Estimates future demand for products based on historical data, market trends, and known business factors.  Additional factors to consider include changes in GPO contracts, onboarding/offboarding customers, supply disruptions, etc.
• Carrying costs: Every additional day of inventory on hand ties up cash that could otherwise be reinvested.
• Slow-moving products: Items that don’t sell quickly take up shelf space, increase risk, and erode margins.
• Supply chain efficiency: Identifying process improvements that reduce excess inventory while still protecting service levels remains a top priority.
• Location: Ensuring inventory is positioned in the correct distribution center to support demand best.

When days of inventory on hand exceed actual demand, pressure builds quickly, reinforcing the need for disciplined inventory management.

A Shared Objective: Service Levels

Despite different perspectives, wholesalers and manufacturers share one core objective: keeping service levels as close to 100% as possible. When a product isn’t available where and when it’s needed, downstream impacts are immediate and far-reaching, affecting providers, pharmacies, and most importantly, patients.

Managing Inventory More Effectively

Managing inventory across the ecosystem requires alignment, transparency, and structure. A variety of approaches can be considered to support inventory challenges:

• Contractual inventory and service level requirements
• Managed buying strategies
• Replenishment schedule modifications
• Leveraging centralized distribution models
• Improved demand planning

Inventory plays an important role in the pharmaceutical supply chain. As industry pressures continue to evolve, organizations that regularly align on how inventory is planned, positioned, and managed across partners are better equipped to maintain high service levels, support strong financial performance, and drive long‑term growth. Taking a proactive approach to reviewing inventory strategies and alignment is a critical step in building a more resilient and effective supply chain. Contact our distribution team today to learn more.