A series of fourteen patients with polycythaemia due to hypoxic lung disease has been treated with a combination of phenylhydrazine hydrochloride and pyrimethamine to reduce the haematocrit level, with doses usually of up to 100 mg/day (and rarely up to 150 mg/day) of the former and never more than 12·5 mg/day of the latter.
Successful reduction of the haematocrit level was achieved in every case without any significant thrombocytopenia, the lowest level ever occurring being 100,000 platelets/mm3 in two patients.
All the patients were improved symptomatically.
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