En la primera parte se evalúan los efectos sedantes, adversos y sobre el sistema cardiorrespiratorio de la romifidina en la especie felina. Se utilizaron cinco y se realizaron 4 grupos experimentales: romifidina 200, 400 y 600 μg/Kg IM y medetomidina 80 μg/Kg IM. En la segunda parte se evalúa la combinación romifidina/ketamina en la especie felina. Se utilizaron siete gatos. Se realizaron 5 grupos experimentales: Romifidina 100 y 200 μg/Kg con ketamina 7,5 y 10 mg/Kg y romifidina 200 μg/Kg con ketamina 5 mg/Kg. Se monitorizó el grado de relajación muscular, la respuesta al clampado y el sistema cardiorrespiratorio durante 60 minutos. Los resultados obtenidos sugieren que el efecto sedante de la romifidina puede ser útil en premedicación anestésica y en intervenciones no dolorosas. La romifidina potencia la actividad de la ketamina, y su combinación compensa parcialmente los efectos adversos de la misma. / Firstly, the sedative, cardio respiratory and adverse effects produced for the administration of romifidine were evaluated in five cats. Four experimental groups were established: romifidine 200, 400 and 600 μg/Kg in comparison to medetomidine 80 μg/Kg. Secondly, the anaesthetic quality, cardiorespiratory and adverse effects produced by the mixture of romifidine and ketamine were studied in seven cats. Five experimental groups were established: Romifidine 100 μg/Kg and ketamine 7.5 mg/Kg and 10 mg/Kg, romifidine 200 μg/Kg and ketamine 5 mg/Kg, 7.5 mg/Kg, and 10 mg/Kg. The drugs were administred intramuscularly. The results of this experience suggest that romifidine could be a good alternative as a sedative for the development of non-painful procedures, as well as anaesthetic pre-medication. Romifidine enhances the anaesthetic effects of ketamine and the disadvantages of each compound are well remedied in the combination. This mixture in combination wit h opioids could be a chance to perform minor surgery procedures.