Here is a breakthrough study from Tunisia indicating the efficacy of sulodexide [Aterina], the oral "fast-moving heparin"-dermatan sulfate formulation, in managing the endothelial dysfunction of and reducing the symptoms associated with Long Covid. Sulodexide is not FDA-approved for Long Covid therapy.
Charfeddine S, Ibnhadjamor H, Jdidi J, et al. Sulodexide significantly improves endothelial dysfunction and alleviates chest pain and palpitations in patients with Long-COVID-19: insights from TUN-EndCOV study. Front. Cardiovasc. Med. 2022, 9:866113. doi: 10.3389/fcvm.2022.866113.
This article cites current guidelines for Long Covid management: