Hey,
I have not tried both.
Xiaflex is too expensive in the UK at the moment (roughy £7,000 per session, at least 2-3 sessions is recommended).
Verapamil is a calcium channel blocker. It has been around for around 40 years and is used for different kinds of treatment.
Xiaflex is an enzyme that dissolves
collagen and has been around for just over 10 years.
My doc, who has treated patients with both
Xiaflex and
Verapamil, describes
Xiaflex as more aggressive of the two while
Verapamil is weaker. Thus, in his experience (just relaying what he told me)
Xiaflex tends to render better results in terms of curvature reduction but
Verapamil is also easier to control.
Another difference is that for
Xiaflex you also receive fewer rounds of injection and fewer injections each round. For
Verapamil, I got injected 13 times each session and had 12 sessions in total. This leads to quite a bit of swelling and bruising, which I am sure is the case for
Xiaflex as well, just saying that the treatment and the effects might differ. I think I saw Dr Trost saying that he believes
Verapamil is more risky since each injection constitutes a risk.
Then again, my doc likely recommends
Verapamil because that is what is available, and Dr Trost is likely to recommend
Xiaflex because that is his preferred form of treatment... Anyway, hope that answers your question.