| A | B |
| emphysema | a chronic lung disease characterized by difficulty breathing and shortness of breath |
| theophyline | a xanthine found in tea |
| theobromine | a xanthine found in chocolate |
| xanthines | the class of chemicals to which caffeine belongs |
| andenosine | an inhibitory neurotransmitter through which caffeine acts |
| caffeinism | excessive use of caffeine |
| GRAS | "generally recognized as safe" |
| phenylpropanolamine) PPA | until 2000, the active indgredient in OTC weight-control products |
| antihistamine | the active ingredient in OTC sleep aids and cough/cold products |
| acetylsalicylic acid | the chemical known as aspirin |
| anti-inflammatory | reducing swelling and inflammation |
| acetaminophen | an aspirinlike analgesic and antipyretic |
| ibuprofen | an aspirinlike analgesig and anti-inflammatory |
| NSAIDs | nonsteroidal anti-inflammatory drugs, such as ibuprofen |
| chlorpheniramine maleate | a common antihistamine in cold products |
| dextomethorphan | an otc antitussive (cough control) ingredient |