Company: PHAT
Filing Date: 2025-03-06
Form Type: 10-K
Source: 0000950170-25-034183
Chunk: 36

Company: Phathom Pharmaceuticals, Inc.
Filing Date: 2025-03-06
Form: 10-K
Item: Item 1
Chunk 36
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0% lansoprazole). 

27

Rates of discontinuation due to adverse events in the maintenance phase were 0.7% for vonoprazan 10 mg, 2.7% for vonoprazan 20 mg, and 0.7% for lansoprazole.

Frequency of serious adverse events, or SAEs, in the healing phase were similar between vonoprazan 20 mg and lansoprazole at 0.6%. In the maintenance phase, SAEs were reported in 4.7% of patients for vonoprazan 20 mg, 3.4% for vonoprazan 10 mg and 2.4% for lansoprazole. Further, this clinical trial was conducted during the 2020-2021 global pandemic, and coronavirus infection was reported in 2.1% of the vonoprazan 20 mg-treated patients and 1.8% of the lansoprazole-treated patients in the healing phase whereas it was reported in 6.1% of the vonoprazan 10 mg-treated patients, 10.1% of the vonoprazan 20 mg-treated patients and 6.7% of the lansoprazole-treated patients in the maintenance phase. There were 2 deaths in the vonoprazan 20 mg-treated patients due to coronavirus infection. None of the coronavirus infection events reported were considered related by the investigator. 

In PHALCON-NERD-301, vonoprazan was generally well tolerated in the initial four-week double-blind, placebo-controlled phase of the trial. The overall adverse events for all vonoprazan arms were comparable to placebo and consistent with what was reported in previous studies. The most commonly reported adverse event was nausea (2.3% vonoprazan 10 mg, 3.1% vonoprazan 20 mg, 0.4% placebo) with no other events reported above 3.0% in either vonoprazan dose arm. There was a total of three SAEs reported in the four-week period of the study, one in the vonoprazan 10 mg arm and two in the vonoprazan 20 mg arm. The most common adverse events reported for the two vonoprazan doses during the 20-week extension period were upper respiratory tract infection, sinusitis, influenza, urinary tract infection, nasopharyngitis,