Vyvanse and AdderallâA Comparison. Vyvanse and Adderall are both amphetamines, a type of stimulant medicine. They work in much the same way. They stimulate the nervous system and increase the amount of neurotransmitters such as dopamine and norepinephrine in the brain. Adderall has been around longer than Vyvanse.
Aromatase, also called estrogen synthetase or estrogen synthase, is an enzyme responsible for a key step in the biosynthesis of estrogens. It is CYP19A1, a member of the cytochrome P450 superfamily (EC 1.14.14.1), which are monooxygenases that catalyze many reactions involved in steroidogenesis.
Aromatase inhibitors lower estrogen levels by preventing the enzyme aromatase-found in fat tissue-from changing other hormones into estrogen. As such, there is less estrogen to bind to receptors in breast cancer cells. In the US, aromatase inhibitors are currently used to treat early-stage breast cancer in postmenopausal women who have been treated with tamoxifen for around 2-3 years.