The absorption and excretion of a new doxycycline solution for intravenous use (DOTC iv) were studied with the following results. 1. Serum levels following one shot intravenous injection of DOTC iv in glucose solution showed a good dose-response comparable with that of the same dose injection of pyrrolidinomethyltetracycline (PRM-TC). The urinary excretion was also examined. In 200 mg injection, nausea, general warm feeling, odor in mouth and tongue numbness were complained. 2. When DOTC iv was injected intramuscularly, the serum level did not reach the peak value and low level continued for a long time. Moderate local pain was complained at the site of injection. 3. The serum level following drip infection of DOTC dry fill showed a dose-response as well. The local vein tolerated well. 4. No abnormalities were found in clinical and laboratory examinations in all volunteers.
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