This depends on the drug and if the drug user is dependent on the drug. For example if a placebo was given to a heroin addict they would still continue to experience unpleasant withdrawal symptoms if they do not receive the drug.
Technically, absolutely nothing should happen. A placebo is substance that is meant to deceive the patient into believing they are getting actual medication. Placebo's are most commonly used in drug trials to see if the drug actually works or simply causing a "placebo effect". Which is a psychological response the brain permits when it believes it is being treated. So ultimately the answer to your question is that no, taking large amounts of a placebo won't harm you. Though if you are experiencing placebo effects then it has the possibility of increasing your response to it.
placebo
A placebo effect
placebo
A placebo.
They take a Placebo .
Scientists use a placebo to check that the variable they are changing actually is responsible for the results they see. It is like a control experiment, allowing you to compare the trial with it to see if there is any effect. It also counteracts the "placebo effect". For example, this is when someone taking a drug calims they "feel better" despite the drug not actually having any effect. Therefore, by giving some test subjects a placebo and some the drug being tested and not telling them which is which, you can eliminate the placebo effect from the test.
By definition, the control group is what the experimental group is measured against. For example, if one is doing an experiment to measure the effect of a drug on blood pressure, the experimental group would receive the drug and the control group would receive the placebo, or blank. The blood pressure of both groups would be measured after ingestion of either the drug or placebo and any differences in blood pressure we would attribute to the effect of the drug. Care must be taken, however, that the two groups are as identical as possible and that all procedures are carried out identically. Furthermore, to eliminate even more bias, both the researchers and the experimental subjects would not know whether they were receiving drug or placebo (a double-blind study).
Sugar pill, inactive drug/medicine/substance...
Placebo
that would greatly depend on the drug and dosage of such drug
placebo