We’ve been at wits end past several months with eleven year old sons constant tummy troubles. Finally got in to see an allergy specialist that I requested referral to specifically because of seeing mast cell disease mentioned on his website bio. Son was diagnosed with mcad- tentatively as we try out meds and await his serum tryptase results. I wanted to post the prescribed meds because if I had ANY idea of what was safe for an 11 year old I would have already tried this and saved him waiting for months and months. Recommendation was one zyrtec daily and twice a day a 75mg Zantac. He already is taking 100g ketotifen at meals and bedtime. I hadn’t been sending the lunchtime tab to school but doing so now!