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D-cycloserine is a broad-spectrum peptide antibiotic produced or synthesized by Streptomyceslavendulae and S.orchidaceus. It is a white crystal with strong hygroscopicity, soluble in water, soluble in low alcohol, acetone and dioxane, and difficult to dissolve in chloroform and petroleum ether. It is stable in alkaline solution, and decomposes rapidly in acid and neutral solution. Cycloserine antibacterial spectrum Chemicalbook wide, in addition to tuberculosis bacilli, most of the gram-positive and negative bacteria, rickettsiae and some protozoa and other inhibition, streptomycin, purple mycin, p-aminosalicylic acid, isoniazid, pyrazinamide and other drug-resistant tuberculosis bacilli also have an effect. Cycloserine and isoniazid had mild synergistic effect on Mycobacterium tuberculosis H37RV, but had no synergistic effect on streptomycin and showed no antagonism. This product is bacteriostasis agent, increase the dosage or prolong the action time with bacteria, also do not appear bactericidal effect.