This is why Merck is buying Cidara Therapeutics for $9.2 billion, and why Wall Street is happy

Core Insights - Merck is encountering a significant patent expiration for its blockbuster drug Keytruda, which is expected to impact revenue streams substantially [1] - The market for Gardasil is experiencing turmoil, indicating potential challenges in maintaining market share and profitability [1] Group 1: Keytruda Patent Cliff - The expiration of Keytruda's patent is anticipated to lead to a decline in sales, affecting Merck's overall financial performance [1] - Keytruda has been a major revenue driver for Merck, and its patent cliff poses a risk to future earnings [1] Group 2: Gardasil Market Challenges - The Gardasil vaccine market is undergoing significant changes, which may disrupt Merck's position in this segment [1] - The upheaval in the Gardasil market could lead to increased competition and pricing pressures [1]