co-tenidone co-tenidone co-tenidone (ban) is a non-proprietary name used to denote a combination of atenolol and chlortalidone. co-tenidone is used in the treatment of hypertension. the use of β-blockers in hypertension was downgraded in june 2006 in the united kingdom to fourth-line because they perform less well than other drugs, and because atenolol, the most frequently used β-blocker, at usual doses carries an unacceptable risk of provoking type 2 diabetes. co-tenidonecombination ofatenololbeta blockerchlortalidonethiazide diureticclinical dataroutes ofadministrationorallegal statuslegal status uk: pom (prescription only) identifierschemspider151231 y (verify) formulation two strengths of co-tenidone are currently available in the uk: 50 mg atenolol and 12.5 mg chlortalidone, ban of co-tenidone 50/12.5 100 mg atenolol and 25 mg chlortalidone, ban of co-tenidone 100/25