Yes, there is a possibility of interaction between several of the medications you are taking, including citalopram, pantoprazole, Indapamide, and sotalol. This interaction may affect your heart, but it may not have serious consequences. It is recommended that you get an electrocardiogram to assess the situation and see if any adjustments to your medication are needed. It is also worth mentioning that the maximum dose of citalopram for someone over 60 is usually 20mg to reduce its impact on the heart. It would be a good idea to discuss this with your pharmacist or doctor to ensure your medication is appropriate for you.