I gave the prevacid only 3 days, but the discomfort was just getting worse so I cant see staying on it longer, I am trying to figure out if Ranitidine is like the zantac, the doctor said she was going to have me take the Zantac if the prevacid did not work but gave me the script for the Ranitidine. The way I feel at this time is I have enough pain do the the shoulder I can't take the added discomfort from trying all these meds, so I will give them a shot & if I feel it is just getting worse I will not take them, I swear some of these meds can with out a doudt cause more pain. Good luck, my family is the same, shame isn't it, the whole family suffers. I wonder if the doctors consider this. Sammy