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In veterinary medicine a bolus is a large time-release tablet that stays in the rumen of cattle, goats, and sheep. It can also refer to a dose of liquid injected subcutaneously with a hypodermic needle, such as saline solution administered either to counteract dehydration or especially to mitigate kidney failure, a common ailment in domestic cats.
Many therapies are administered as a "bolus" or one-time dose, but they may also be administered as an extended infusion or drip. The act of administering a therapy intravenously, or placing an intravenous line ("IV line") for later use, is a procedure which should only be performed by a skilled professional.
Subcutaneous administration is the insertion of medications beneath the skin either by injection or infusion.. A subcutaneous injection is administered as a bolus into the subcutis, the layer of skin directly below the dermis and epidermis, collectively referred to as the cutis.
The required loading dose may then be calculated as = For an intravenously administered drug, the bioavailability F will equal 1, since the drug is directly introduced to the bloodstream. If the patient requires an oral dose, bioavailability will be less than 1 (depending upon absorption, first pass metabolism etc.), requiring a larger loading ...
Injections generally administer a medication as a bolus (or one-time) dose, but can also be used for continuous drug administration. [3] After injection, a medication may be designed to be released slowly, called a depot injection, which can produce long-lasting effects.
The specific drug, dose, and frequency of administration impacts the risk for and severity of complications. Complications of epidural steroid administration are similar to the side effects of steroids administered in other manners, and can include higher than normal blood sugar, especially in patients with type 2 diabetes. [16]
The extended bolus is also useful for those with slow digestion (such as with gastroparesis or coeliac disease). A combination bolus/multiwave bolus is the combination of a standard bolus spike with an extended bolus square wave. This shape provides a large dose of insulin up front, and then also extends the tail of the insulin action.
Prandial insulin, also called mealtime or bolus insulin, is designed as a bolus dose of insulin prior to a meal to regulate the spike in blood glucose that occurs following a meal. The dose of prandial insulin may be static, or may be calculated by the patient using either their current blood sugar, planned carbohydrate intake, or both.