Hello! Welcome and thank you for your question on HCM! Regarding your concern, I would like to explain that olmesartan and nebivolol both increase serum potassium. The fact that you are taking Potassium supplements with these two drugs, can cause high levels of potassium leading to different symptoms. From the other hand lamotrigine can increase the side effects of paxil, leading to serotoninergic syndrome (causing uncontrolled high blood pressure, flushing, mental changes, etc). Regarding the gum damage, it may be relate to lamotrigine intake. I recommend consulting with your doctor on the possibility of making some changes to your therapy, taking into considerations these potential interactions and your medical condition (you may need to switch into another anti-epileptic drug other than lamotrigine and lower Benicar dose) I also advise to perform some lab tests (blood electrolytes, complete blood count) to avoid high blood levels of potassium. Hope to have been of help! Best regards, Dr. Iliri