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 found occurring naturally in tea leaves, coffee beans, cola nuts, matÃ©. leaves and the guarana plant. A white crystalline powder with a melting point of range of. 234 to 236.5 ï°C, caffeine has the chemical name of 1,3,7-trimethylxanthine.