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Lead researcher Marja Jäättelä and her team from Danish Cancer Society Research Center (DCRC) have sent 12 samples of antihistamines shown to improve cancer treatment to Olli Vapalahti [snopyta.org] of Helsinki University who has set up a COVID-19 test lab.[1]
If they prove to be helpful in treating COVID-19 it would provide a much safer alternative to chloroquine and hydrochloroquine treatments, which seems to have a positive effect especially in combination with antibacterial azithromycin [mediterranee-infection.com], but aren't as safe as antihistamines.
The specific allergy drugs who has a positive effect in cancer treatment is Loratadine [wikipedia.org] where results show 24% lower chance of death and Ebastine [wikipedia.org] showing 14% lower chance of death.[2]
It would definitely be a lot safer if crazy people start gobbling allergy pills instead of ingesting aquarium accessories [www.cbc.ca].
[1]: https://www.cancer.dk/nyheder/forskere-fra-kraeftens-bekaempelse-vil-afproeve-allergimedicin-som-middel-mod-coronavirus/ [cancer.dk] (danish)
[2]: https://www.cancer.dk/nyheder/allergimedicin-kan-goere-kemoterapi-mere-effektiv/ [cancer.dk] (danish)