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Combination of
AtenololBeta blocker
ChlortalidoneThiazide diuretic
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[[{{{component4}}}]]? Class
[[{{{component5}}}]]? Class
Clinical data
Routes of
Legal status
Legal status
  • UK: POM (Prescription only)
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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 as they perform less well than other drugs, and that atenolol, the most frequently used β-blocker, at usual doses carries an unacceptable risk of provoking type 2 diabetes.[1]


Two strengths of co-amilozide is 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



  1. Sheetal Ladva (28/06/2006). "NICE and BHS launch updated hypertension guideline". National Institute for Health and Clinical Excellence. Check date values in: |date= (help)