The short version
Only one company currently supplies this market — there is no backup if it stumbles. The price has fallen 41% in a year, to $0.2540 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 is a fragile supply — if anything else goes wrong, there is very little slack to absorb it.
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