Strange, where is the sources backing up that it should always be painless? Found lots of resources pointing towards that many do in fact feel a burning sensation from potassium IV:
Yep, pain at the infusion site is an incredibly common complaint with potassium IV. The person you replied to is talking confidently outside of their expertise.
- https://cms.galenos.com.tr/Uploads/Article_21792/EAJEM-16-14...
- https://www.webmd.com/drugs/drugreview-6224-potassium-chlori...
- https://www.nyspana.net/wp-content/uploads/2017/10/NYSPANA-P...
- https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2730072/
- https://pubmed.ncbi.nlm.nih.gov/3063479/
- https://musculardystrophynews.com/forums/forums/topic/17193/
- https://www.nursingcenter.com/journalarticle?Article_ID=3535...