From the paper:
"[...] ivabradine appears to be a reasonable option for patients with POTS who have failed or are unable to tolerate other treatment options [...]"
https://www.ncbi.nlm.nih.gov/pubmed/29330767
"[...] ivabradine appears to be a reasonable option for patients with POTS who have failed or are unable to tolerate other treatment options [...]"
https://www.ncbi.nlm.nih.gov/pubmed/29330767