Mononucleosis, or mono, is a viral infection that causes fever, sore throat, and swollen lymph glands, most often in the neck. Mono is often spread by saliva and close contact. It is known as the kissing disease.. Mono occurs most often in people ages 15 to 17, but the infection may develop at any age.
An assortment of psychoactive drugs-street drugs and medications. A psychoactive drug, psychopharmaceutical, or psychotropic is a chemical substance that changes brain function and results in alterations in perception, mood, or consciousness.
People who are abusing a drug, whether it's a prescription drug or a street drug, develop a tolerance to the drug, Dodd said. Tolerance is where the user must take more and more of the drug to get the same effect. For some drugs, it does not take very long for a tolerance to develop. Abuse also includes using prescription drugs for recreational purposes, not taking them as prescribed and sharing medication.