my husband age 76 has slightly swelled eyelids and feels like he needs to clear his throat...so I m thinking some swelling there also. He had canned Progresso soup. Ingred. include Sodium phosphate but that is also in Campbell s Cream of Chicken Soup he eats frequently. I gave him 50 mg. of diphenyldramine HCL about 1 1/4 hrs. ago. Doesn t seem to have gotten worse....but also swelling of eyelids has not gone down. Still feels like his throat is affected....but better than 1 1/2 hrs. ago. Years ago he had a reaction similar when he ate some trail mix....says this feels the same. My question is since it hasn t worsened.....how long do we wait to act further if it doesn t get a lot better? More of the antihistamine at some point?