Brief Answer: may affect atenolol action Detailed Answer: Hi, thanks for using healthcare magic There is a risk of potential interaction between indomethacin and atenolol. Indomethacin can decrease the effects of atenolol by what is known as pharmcologic antagonism. This it may affect the ability of the atenolol to effectively reduce the blood pressure. You would have to monitor your blood pressure and note any abnormal increases. In addition, there is the potential for increased potassium levels. Both of these agents can potentially increase potassium but this can be monitored by your doctor, it may not rise to a significant level. There is no interaction with lorazepam or with dairy products. I hope this helps,feel free to ask any other questions

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