Question: what over the counter medications can make you high?
Answer: Dextromethorphan (DXM) DXM is used for temporary relief of cough caused by the common cold. ... 
Loperamide. Loperamide is a synthetic opioid that is taken to relieve diarrhea. ... 
Pseudoephedrine/phenylephrine. ... 
Diphenhydramine (DPH) ... 
Acetaminophen. ... 
Oxybutynin transdermal system. ... 
Antacids. ... 
Other regularly abused OTC products.