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Stability of essential drugs in Zimbabwe. Matched pairs from same batch of retinol (gain) and ergometrine (loss) were unstable; acetylsalicylic acid, amoxicillin, ampicillin, benzylpenicillin, doxycycline, epinephrine, ferrous sulfate, phenoxymethylpenicillin, procaine benzylpenicillin, and tetracycline were stable
