Dear Sir/Madam Thanks for your query to us. A swelling of stomach from supple to inflexible is something which worries me. It can be fluid! your heart rate has gone up. Cause ? whenever the heart rate increases we look for the cause of increased heart rate and drugs like bisoprolol (betablockers, rate reducing drugs)are prescribed only when we do not find out a correctable cause. one apparent cause in your case is amlodipine which may increase heart rate in certain individuals. But there can be other causes. overall a combination of increase heart rate and abdominal fullness may point to a significant cause/ disease. Please see your internal medicine expert/ cardiologist on priority. Sincerely Sukhvinder singh