Tried to look online to find out if I can take an antihistamine while taking methotrexate and cannot find any answers. I had a bad case of prickly heat about 6 years ago and ever since then I have taken antihistamine roughly one month before going on holiday. I was in the sun for a few hours yesterday going indoors and outdoors as it was very warm. Today I have a rash under my skin on both arms. Does anyone know if I am able to have antihistamine? Thanks in advance 😀
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