The present invention relates to crystalline forms comprising telmisartan and at least one beta blocker, especially a selective β1 receptor blocker, especially to salts or co-crystals of telmisartan and a beta blocker, preferably selected from selective β1 receptor blockers, processes for preparation of the same and their use as medicament or in pharmaceutical formulations, more particularly for the treatment of hypertension, heart failure and myocardial infarction.