Subject: What are the affects of drugs on plants?

For my biology class, we have to make an experiment using plants.  I've 
decided to see if drugs (tylenol, aspirin, advil, naprosyn E, and motrin 
IB) have an affect on the growth of plants. At the moment, the plant 
receiving tylenol is growing faster than the controlled plant (the only 
non-drugged plant). Also the plant receiving aspirin has fallen over and 
appears to be dying. As well, the leafs of the plant receiving motrin IB, 
have fallen off. The remaining plants are no different than the controlled 
plant. I was wondering if there is any explanation for this. Thanks.

Re: What are the affects of drugs on plants?