Glaucoma is a group of eye conditions in which fluid builds up in your eye causing gradual vision loss. Ocular migraine Ocular migraine usually refers to a type of migraine that can cause temporary blindness in one eye.
Increased Blood Pressure. The combination of caffeine and ephedrine can increase your blood pressure. Ephedrine and caffeine stimulate your sympathetic nervous system by increasing neurotransmitters, such as norepinephrine. This stimulant effect can increase your blood pressure by constricting your blood vessels. This is why many diet pill formulas, often called an ECA stack, contain ephedrine, caffeine and aspirin to thin your blood to offset the blood vessel constriction.
As long as caffeine is in your blood, it's effects will also manifest. The time it takes for the body to eliminate one half of a caffeine dose is normally between 3 to 12 hours.It is called the half-life of caffeine.Several factors can shorten or lengthen the half life of caffeine.Smoking, medications and diseases are some factors.f you regularly drink a cup of coffee or tea in the morning and another in the evening, you can expect to have caffeine in your blood every hour of the day. The effect of caffeine in your body will be active 24/7.