Just so u know what u are buying, Brokaid and Primatine are bronchodilators. They open/expand/dilate airways to allow for easier breathing with respiratory difficulties such as asthma and I use it for bronchitis as needed.
Start slow, like 12.5mg first thing in the AM. As u increase ur dosage, remember that u do NOT have to feel a stim effect for thermo genic effect. Imo this is where people began to mega dose bc they built a stim tolerance. Maybe this could be where u could run into blood pressure issues by going way overboard with dosing by looking for more stim effect