Sertraline should not be taken with or within two weeks of taking monoamine oxidase inhibitors (MAOIs). These include phenelzine (NardilÂ®), tranylcypromine (ParnateÂ®), isocarboxazid (MarplanÂ®), rasagiline (AzilectÂ®), and selegiline (EmsamÂ®).
Pure caffeine is a white, tasteless substance that makes up as much as 5% of. the weight of tea leaves. By structure, caffeine is closely related to the purine bases, guanine and adenine, found in deoxyribonucleic acids (DNA).
Caffeine is a naturally occurring chemical stimulant called trimethylxanthine. Its chemical formula is C8H10N4O2 (see Erowid: Caffeine Chemistry for an image of the molecular structure). It is a drug, and actually shares a number of traits with more notorious drugs such as amphetamines, cocaine and heroin.n its pure form, caffeine is a white crystalline powder that tastes very bitter. It is medically useful to stimulate the heart and also serves as a mild diuretic, increasing urine production to flush fluid out of the body. Caffeine has been an integral part of global culture for hundreds of years.