The term is insufficiently specified; there is "Gross Profit Margin" which considers only COGS, so works roughly as you suggest. There is also "Operating Profi

The term is insufficiently specified; there is "Gross Profit Margin" which considers only COGS, so works roughly as you suggest. There is also "Operating Profit Margin," which would include current R&D costs, which (assuming they are non-declining over time) would account for development costs. If the company took on debt to develop the drugs, then "Net Profit Margin" would also include the cost of servicing that debt.