Drug Name Alesse

Phosphate depletion of the body with excessive intake of Al(OH)3. Na+ ions remain in solution even in the presence of HCO3 –-rich pancreatic secretions and are subject to absorption, like HCO3 –. Because of the uptake of Na+, use of NaHCO3 must be avoided in conditions requiring restriction of NaCl intake, such as hypertension, cardiac failure, and edema.
The effect of a substance depends on the amount administered, i. e. , the dose. If the dose chosen is below the critical threshold (subliminal dosing), an effect will be absent. Depending on the nature of the effect to be measured, ascending doses may cause the effect to increase in intensity.

 

This fact assumes practical significance with any drug that may be rapidly transformed or possibly inactivated in the liver (first-pass hepatic elimination). Even with rectal administration, at least a fraction of the drug enters the general circulation via the portal vein, because only veins draining the short terminal segment of the rectum communicate directly with the inferior vena cava.
This property is exploited therapeutically when loss of blood necessitates refilling of the vascular bed, e.g., by infusion of dextran solutions. The vascular space is, moreover, predominantly occupied by substances bound with high affinity to plasma proteins; determination of the plasma volume with protein-bound dyes).