Is Asclera (polidoconal) a Safer Sclerosant Than Sodium Tetradecyl Sulfate?

Both of these medications are in the same family. I would suggest you ask your physician about using glycerin or even an older hypertonic saline solution. The risk of anaphylaxis (which can be delayed up to 24 hours), is too great. 

Asclera contraindication include patients with known allergy (anaphylaxis) to polidocanol and also patients with acute thromboembolic diseases. Your vein specialist can advise you in detail about treatment. I encourage you to visit your vein specialist to decide on best plan option for your treatment. 
Best,