Which of the following drugs cause tachycardia:

Correct Answer: B

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Correct Answer: B

Rationale: The correct answer is B because diarrhea and ringing in the ears are potential side effects of lithium carbonate that should be reported to the doctor immediately to prevent complications. This response demonstrates understanding of the importance of monitoring side effects. A is incorrect because the therapeutic effects of lithium carbonate may take weeks to manifest, not a couple of days. C is incorrect because doubling the dose after missing one can lead to overdose and toxicity. D is incorrect because while lithium carbonate can affect sodium levels, strict salt restriction is not necessary unless advised by a healthcare provider.

Correct Answer: C

Rationale: The correct answer is C: Carbamazepine (Tegretol). This medication is commonly prescribed for rapid cycling bipolar disorder due to its mood stabilizing properties. Carbamazepine helps regulate mood swings and prevent frequent cycling. Clonidine (A) is mainly used for hypertension and ADHD. Phenytoin (B) is an antiepileptic drug and not typically used for bipolar disorder. Chlorpromazine (D) is an antipsychotic primarily for schizophrenia. Carbamazepine is the most appropriate choice for managing rapid cycling in bipolar disorder.

Correct Answer: C

Rationale: The primary purpose of the beta blocker acebutolol in dysrhythmias is to decrease heart rate and decrease myocardial contractility. This is because beta blockers work by blocking the beta-adrenergic receptors in the heart, leading to a reduction in heart rate and myocardial contractility. This helps in controlling the rhythm of the heart and preventing arrhythmias. Choice A is incorrect as the primary purpose of acebutolol is not to increase oxygen to the systemic circulation. Choice B is incorrect as while beta blockers do help in maintaining heart rate, they do not necessarily regulate blood pressure directly. Choice D is incorrect as beta blockers actually decrease myocardial contractility rather than increase it.

Correct Answer: D

Rationale: The correct answer is D because memory difficulties are often associated with a decrease in acetylcholine levels in the brain. Medications that prevent the destruction of acetylcholine can help improve memory function. Option A, increasing dopamine activity, is more related to conditions like Parkinson's disease. Option B, increasing GABA levels, is more relevant to anxiety disorders. Option C, reducing dopamine activity at receptor sites, is not directly linked to memory improvement but rather to conditions like schizophrenia. Thus, option D is the most appropriate choice for addressing memory issues.