Cetirizina has been provided by the pharmacist as an anti histamine due to problems with mosquito bites. I provided details of the drugs I am prescribed for RA - matrex & folic acid 10 mg each once per week and Humira 40g injected biweekly but she didn't seem too knowledgeable on Humira. Can I safely take Cetirizina (dihidrocloruro) with the drugs noted above? Thanks in anticipation.