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 in coffee and its effects. Scientifically speaking, Caffeine is an odourless, bitter white alkaloid that belongs to the Xanthine chemical group and is represented in the chemical formula (C8H10N4O2). It is known in Pharmacology as 1,3,7-trimethylxanthine.