Dihydrodibenzo[b,f]thiepin compounds of formula (I) and process for making them. These compounds have antiinflammatory action. ##STR1## wherein R represents a hydrogen, fluorine atom, a trifluoromethyl, 1-5C lower alkoxy, hydroxy, hydroxyethoxy, aminoethoxy group or the group of the formula --OCH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 OH, Y represents a hydroxy group or the group of the formula ##STR2## (R.sub.3 and R.sub.4 represent a 1-4C lower alkyl group or R.sub.3 and R.sub.4 may jointly form a heterocyclic group together with an adjacent nitrogen atom.