FIELD: medicine, pharmaceutics.SUBSTANCE: invention relates to field of immunology and biotechnology. Claimed is monoclonal antibody or its functional fragment, where said antibody and fragment bind with activated protein C and inhibit anticoagulant activity, but do not bind and do not inhibit activation of inactivated protein C, where said antibody is obtained by immunisation of mammal by APC and screening of binding ability of said antibody with APC, but not with protein C. Also described is pharmaceutical composition for treating diseases associated with anticoagulation activity of APC, including said antibody in effective amount and pharmaceutically acceptable carrier. Claimed are: method of inhibiting anticoagulation activity of activated protein C in subject, method of inhibiting amidolytic activity of activated protein C in subject, method of treating subject, requiring blood coagulation； method of treating subject with haemophilia； method of modulating haemostasis in subject； as well as method of modulating thrombogenesis in subject, which include introduction of effective quality of said antibody to subject. In addition, described is method of treating subject with sepsis, including introduction of effective quality of said antibody and activated protein C.EFFECT: invention makes it possible to obtain monoclonal antibody or its functional fragment, where said antibody and fragment bind with activated protein C and inhibit anticoagulation activity, but do not bind and do not inhibit activation of inactivated protein C.17 cl, 11 dwg, 6 exИзобретение относится к области иммунологии и биотехнологии. Представлено моноклональное антитело или его функциональный фрагмент, где указанные антитело и фрагмент связываются с активированным протеином С и ингибируют антикоагулянтную активность, но не связываются и не ингибируют активацию неактивированного протеина С, где указанное антитело получают иммунизацией млекопитающего APC и скринингом связывающей способности указ
