Merck & Company Inc.: IDVYNSO (doravirine/islatravir) · HIV-1 Infection.
Run-up into the decision (T-120 → T+5)
Daily close, T-120 (11/4/25) through T+5. Run-up high $123.93 on 2/25/26, low $82.49 on 11/11/25 (T-120 to T-1). FDA decision 4/21/26. Historical price action, not a forecast.
Was IDVYNSO (doravirine/islatravir) approved by the FDA?
Yes. The FDA approved the application for IDVYNSO (doravirine/islatravir) on April 21, 2026. The primary source is linked on this page.
Which company is behind IDVYNSO (doravirine/islatravir)?
IDVYNSO (doravirine/islatravir) is a Merck & Company Inc. (MRK) program. The FDA decision came on April 21, 2026; the company's own announcement is linked on this page.
How did MRK stock trade into the FDA decision?
Measured over the 120 trading days before the decision (T-120 to T-1), MRK moved +33.1%. That is the recorded price path into this specific event -- historical measurement, not a prediction, and not investment advice.
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