 [ Symptoms ] i am taking azithromycin 250 mg and now i have diarrhea can i take imodium with this [ Disease ] no hives are not contagious hives can appear from a allergic reaction  eg foods injections etc  allergy medication such as bendryl can take the terrible itch away and dense up the color if one spot goes away another cluster can form if you have chest tightness a fever or trouble swallowing get to the hospital hives can last for days months or even years