The therapeutical use of tetracyclic derivatives and pharmaceutically acceptable salts thereof having general formula (I), for treating diseases related to venous function deficiency and/or inflammatory oedema, is disclosed. In general formula (I), X is a carbon atom or a nitrogen atom; T is a carbon atom or a nitrogen atom; L is an oxygen atom or a ketone function protecting grouping; R1 is a hydrogen atom, a halogen atom or a C1-5 alkyl radical; R2 is a hydrogen atom, a halogen atom, a nitro radical or a C1-5 alkyl radical; and n and m are 0 or 1 but not independently so, whereby when n is 1 then m is 0, and vice versa.