Features of piracetam include all of the following EXCEPT:

Correct Answer: D

Rationale: The correct answer is D: It has a high potential of toxicity. Piracetam is known for its low toxicity and safety profile, making it a popular nootropic. A: It is not a GABA derivative, but it does modulate some GABA receptors. B: It does influence neuro-vegetative functions positively. C: Improvement with piracetam typically starts earlier, around the 2nd week, rather than the 3rd week as mentioned in the incorrect choice.

Correct Answer: C

Rationale: The correct answer is C: Desoxiribonuclease. Desoxiribonuclease is an enzyme that breaks down DNA, not disulfide bonds of proteoglycans. A: Acetylcysteine breaks disulfide bonds, reducing sputum viscosity. B: Ambroxol disrupts disulfide bonds, aiding in sputum clearance. D: Bromhexin also works by disrupting disulfide bonds, facilitating mucus clearance.

Correct Answer: A

Rationale: The correct answer is A: Radioactive phosphorus 32. Radioactive phosphorus 32 depresses erythrogenesis by inhibiting DNA synthesis in rapidly dividing cells like erythroblasts. Ferrous sulfate (B) is an iron supplement that promotes erythropoiesis. Molgramostim (C) is a granulocyte-macrophage colony-stimulating factor, which stimulates white blood cell production, not erythrogenesis. Folic acid (D) is essential for DNA synthesis and red blood cell production, so it would not depress erythrogenesis.

Correct Answer: C

Rationale: Rationale: C is the correct answer because cardiac glycoside-induced ventricular tachyarrhythmias are more common in patients with hypokalemia, not hyperkalemia. This is due to the increased sensitivity of the myocardium to glycosides in the setting of low potassium levels. A: Lidocaine is not the drug of choice for treating these arrhythmias; instead, antiarrhythmic medications like phenytoin or amiodarone are preferred. B: Digibind (Digoxin-specific antibody) is used in severe cases to reverse the effects of cardiac glycosides. D: Patients with heart failure or preexisting heart damage are at higher risk for developing these arrhythmias due to impaired cardiac function and increased susceptibility to glycoside toxicity.

Correct Answer: A

Rationale: Step 1: Dipyridamole is a phosphodiesterase inhibitor that increases cyclic adenosine monophosphate (cAMP), leading to coronary vasodilation. Step 2: Myotropic agents act directly on vascular smooth muscle to cause vasodilation. Step 3: Dipyridamole's mechanism fits the definition of a myotropic coronary dilator. Summary: Atenolol (C) is a beta-blocker that works by blocking beta-adrenergic receptors. Validol (B) is a menthol-based preparation for angina relief. Alinidine (D) is a selective I1-agonist used for hypertension, not as a coronary dilator.