Hi! I have gone through your question and I understand your concern.
I would say that's using these medication together may increase the risk of having the side effect that each drug have it that would be taken alone .
I will write you the possible interaction between these drug .
-The interaction
diltiazem (cardizem)-atenolol- ( Both medication affect the heart and blood vessels ,atenolol the lungs Also.:
Fatigue, headache ,
shortness of breath ,
chest pain , swollen legs with weight gain , irregular heartbeat , fast or slow heart beat
-The interaction Atenolol-
furosemide is that they low blood pressure and slow your
heart rate, so you will experience the symptoms :
Dizziness, fainting, weakness,irregular heart beat.
-The interaction Diltiazem ( Cardizem)-
Apixaban (Eliquis) : The interaction consist in the fact that diltiazem increases the blood levels of Apixaban in result you may have a high risk of bleeding complications. Be aware of you have any of these symptoms : bruising, anusual bleeding,red or black stools,lightheadness, weakness.
I would suggest to measure you blood pressure , heart beat every day ,check your platesls account every 3 month.If you have any of the symptoms that I mentioned call immediately your doctor , he will do the changes of the medications.
Wish you good health!
Thank you for using HCM. If you have any other questions feel free to ask me again.