 [ Symptoms ] suffering from involuntary movements spasms doctors do not know what is wrong [ Disease ] i cannot imagine how ranitidine    a totally different drug and drug class    would result in a false positive test for amphetamines most people who get positive drug tests actually took the drug and are lying about it i am not saying that mistakes can happen but they are very rare i truly hope that is the case i have been clean my whole pregnancy & never touched amphetamines before thank you for your answer 