The short version
20 companies supply this market — deep enough that no single failure threatens the supply. The price has fallen 35% in a year, to $0.1400 per unit — and generics that get this cheap tend to get abandoned rather than defended. One of its named manufacturing plants, Zhejiang Huahai Pharmaceutical Co., Ltd., failed FDA inspectionwithin the last two years — the agency’s most serious outcome. Put together: this looks like a healthy supply — the boring kind, which is exactly what you want.
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