The present invention relates to pharmaceutical compositions, kits and methods for the treatment of diseases related to the renin-angiotensin system (RAS), such as e.g. hypertension. The pharmaceutical compositions according to the invention comprise at least one aspartyl aminopeptidase inhibitor and at least one angiotensin-converting-enzyme (ACE) inhibitor, or at least one aspartyl aminopeptidase inhibitor and at least one chymase inhibitor.