Hi and welcome to the forum! I am glad that I can help you.
You would like to know whether there is any medication that reduces the heart rate.
Normal heart rate is between 60 and 80 beats per minute. A heart rate lower than 60 beats per minute is called bradycardia and the heart rate over 100 beats per minute is called tachycardia. Tachycardia may appear as a result of decreased blood pressure due to dehydration or bleeding or may appear due to abnormalities in the impulse transmission. Depending on the cause tachycardia may be treated by increased fluid intake or beta-blockers.
Given the data that you described, the tachycardia that you experienced may be only temporary. You may consider seeing a cardiologist for further diagnosis and treatment options. Please consult a cardiologist before starting the treatment.
Please keep in mind that I only provide medical information. I am not able to diagnose medical conditions online. Please contact your doctor or other qualified healthcare provider such as a cardiologist about further advice and information about diagnosis and treatment options.