Following suggestions to your queries...
Hi there my dear,
I am sorry for the situation you twin sister is in. I am happy that you are so comprehensive to understand your current health and mental situation perfectly and to collaborate with your doctor.
As you know, different people do have different personality which will determine their social relationships. So, nothing to blame to your sister, and I highly appreciate your good understanding and your willing to help your twin. May God recompenses what you are doing for her.
Now, please bare in mind that heart rhythm problems (tachycardia
as in case of your sister) are often associated with neurological issues. If the neurological problems will be correctly treated, subsequently, tachycardia will be improved too.
Yes, you are right, serotonin re-uptake inhibitors are the drugs of choice in order to correct her serotonin levels in the brain. The most common side effects associated with their use include tachycardia and hypotension
. That's why patients are scheduled for regular follow ups to catch the side effects in time.
With regards to dosage, should evaluate her heart problems first and then, can correct the dose accordingly. You can send her test reports to me (cardiac tests or neurological exams), so I can evaluate them myself for further assistance.
Hope it was of help! All the best!