Hi, yes it is safe. Interactions between your selected drugs. No results found - however, this does not necessarily mean no interactions exist. ALWAYS consult with your doctor or pharmacist. There is no known interaction between Atenolol and Cialis in our records. However, an interaction may still exist. However, an interaction may still exist. Always consult your doctor before taking these medications together. Just be aware of the symptoms of low blood pressure and it would only be dangerous to take these 2 together if your blood pressure is considerably low already. 12.5 mg of atenolol is a low dose and if Viagra 25mg works for you I think you will be alright. Summary. Drug interactions are reported among people who take Atenolol and Cialis together. This study is created by eHealthMe based on reports of 401 people who take Atenolol and Cialis from FDA, and is updated regularly. Doctors give trusted answers on uses, effects, side-effects, and cautions: Dr. Turck on is atenolol safe to take: There are no interactions between the two, so they are safe to take together. Question. I have been diagnosed with hypertension (high blood pressure) and prescribed atenolol tablets BP 50mg. If I take Viagra, would this be harmful? How to use Atenolol. See also Warning section. Take this medication by mouth with or without food as directed by your doctor, usually 1 to 2 times daily. atenolol oral and tadalafil oral atenolol oral increases effects of tadalafil oral by added drug effects. There may be an increased chance of low blood pressure. The atenolol is not heping your erections but it is not the cause of erectile dysfunction. There are many who take beta blockers and have no ED.