So, what gives? Is the popular herbal beverage a hallucinogen in disguise? Let’s delve into the possible reasons behind this rare phenomenon. In a person with hypertension, this effect might make their blood pressure drop closer to normal levels. But for someone who already has normal to low blood pressure, it could potentially result in low levels. Low blood pressure can cause dizziness, lightheadedness, blurry vision, and poor concentration. It may even lead to nausea or fatigue. Basically, low blood pressure can make you feel unsteady and out of touch—which may explain what some people have felt after drinking hibiscus tea.