Yes, I am a Tikosyn user for over the past year. I have a lifetime of extra beats that in the past 4 years, turned into Afib. Over the years, I've been on all the heart meds and this one is new and it is lactose-free which is important to me since I have milk intolerances and all others exacerbate my arrhythmia. Tikosyn, 200mg am/pm worked well with acebutolol for tackycardia for me. Wanting to get rid of the Afib, the doc did a 5 hr. cryoablation in Jan. After, because I was terribly unstable (in my 70s) he jacked me up to 400 mg am/pm where I remain. My Afib is gone after 3 mo. I am in sinus rhythm., but still go into tacky when eating foods I'm intolerant of, and for that, I just pop an acebutolol and if serious, 0.25 mg. clonazepam. I am also on the anticoagulant, Savaysa, which also is dairy free. Tikosyn works well for me, and my regimen of heart meds is practical and not overdone. But after that ablation (my 3rd.), I am left with MCAS, a mast cell illness, probably because of the massive antibiotics given in surgery.