And this article on Ivermectin with Polysorbate80

US Patent for Solubilization of ivermectin in water Patent (Patent # 4,389,397 issued June 21, 1983) - Justia Patents Search
The most preferred of the non-ionic ... is polysorbate 80. The aqueous solution of the avermectin and the surface active agent is prepared by dissolving the avermectin in the surface active agent such that the surface active agent will constitute from 0.5 to b 25% w/v preferably from 4 to 25% w/v of the final solution. The ivermectin is present ...

https://patents.justia.com...

And this Ivermectin has it...

"Parid EQ Liquid for Horses - Drugs.com
Parid EQ™ (ivermectin) Liquid is a clear, ready-to-use solution with each mL containing 1% ivermectin (10 mg), 0.2 mL propylene glycol, 80 mg polysorbate 80, 9 mg sodium phosphate monobasic monohydrate, 1.3 mg sodium phosphate dibasic anhydrous, 1 mg butylated hydroxytoluene, 0.1 mg disodium ..."

https://www.drugs.com/vet/...

And this about Polysorbate80 and pregnancies...

"What Is Polysorbate 80 And Why Should You Avoid It?
The study involved a patient who had a severe allergic reaction following the intravenous administration of a vitamin product during pregnancy, with Polysorbate 80 identified as the culprit. The tests showed that the response was not linked to immune system antibodies, highlighting the agent’s ..."

https://thegoodhuman.com/w...

More about Polysorbate 80

Polysorbate 80 - Wikipedia
This allows them to join in chains and nets, which hold air in the mixture, and provide a firmer texture that holds its shape as the ice cream melts. Polysorbate 80 is also used as a surfactant in soaps and cosmetics (including eyedrops), or a solubilizer, such as in a mouthwash.

And it is in this Ivermectin...

https://www.tandfonline.co...

Well I just found it is in this Ivermectin...

https://dailymed.nlm.nih.g...