Benzodioxepines of the formula (I) and physiologically tolerated salts and solvates thereof, in which R.sup.1, R.sup.2, R.sup.3, R.sup.4, A, B, a and b have the meanings indicated in claim 1, are ligands of the 5HT1A receptors and/or the 5HT4 receptors with simultaneously strong serotonin reuptake inhibition. They can be employed for the treatment and prophylaxis of various diseases ##STR00001##