Dear sir I am taking nexum 40 mg +metronidazole 400 mg in morning and 300 mg Zantac (ranitidine) evening time and 40 mg famotidine at night +metronidazole 400 mg?

Your question...? Your drug regimen is quite unorthodox--there is no apparent reason to combine two h2 blockers (zantac (ranitidine) and famotidine), nor is it clear what Metronidazole is treating here. Happy to assist, if we know what you're asking & you can provide a little more information please.