Drug Name Antabuse

Tetrahydrofolic acid (THF) is required for the synthesis of both purine bases and thymidine. Formation of THF from folic acid involves dihydrofolate reductase. The folate analogues aminopterin and methotrexate (amethopterin) inhibit enzyme activity as false substrates. As cellular stores of THF are depleted, synthesis of DNA and RNA building blocks ceases.
Norepinephrine differs from epinephrine by its high affinity for ?-receptors and low affinity for ?2-receptors. In contrast, isoproterenol has high affinity for ?-receptors, but virtually none for ?-receptors (A). norepinephrine ?, ?1 epinephrine ?, ?1, ?2 isoproterenol.

 

Patients are randomly allotted to two groups, namely, the placebo and the active or test drug group. In a double-blind trial, neither the patients nor the treating physicians know which patient is given drug and which placebo. Finally, a switch from drug to placebo and vice versa can be made in a successive phase of treatment, the cross-over trial.
Both mechanisms converge via factor X into a common final pathway. The clotting factors are protein molecules. “Activation” mostly means proteolysis (cleavage of protein fragments) and, with the exception of fibrin, conversion into protein-hydrolyzing enzymes (proteases). Some activated factors require the presence of phospholipids (PL) and Ca2+ for their proteolytic activity.