Additionally, stimulants like cocaine, methamphetamine, and even caffeine cause dehydration and dry mouth. A beer with caffeine, ginseng, guarana and alcohol. Tea contains more caffeine than coffee by dry weight. This may involve avoiding or limiting consumption of caffeine and alcohol. Cocaine, caffeine, and cathinone are stimulants of the central nervous system. Sudden cessation of high-dose corticosteroids, opioids, barbiturates, benzodiazepines, caffeine, or alcohol can induce myalgia. Other factors can play a role, including certain foods and drinks, nicotine, caffeine, and smells. He would also sustain himself on copious amounts of coffee and caffeine pills. Some of these caution against foods containing excessive sugar, caffeine and white flour. Tablets containing standardized doses of caffeine are also widely available. Thus, teas contain varying amounts of caffeine. Anxiety can temporarily increase during caffeine withdrawal. Cannabis is a popular recreational drug around the world, only behind alcohol, caffeine, and tobacco. There are a number of food ingredients that naturally contain caffeine. Anxiety can temporarily increase during withdrawal from caffeine and various other drugs.