Medical Science Test 2 Nddc Scholarship

Clonidine is an alpha-2 adrenergic agonist that reduces sympathetic outflow. This lead to a decrease in blood pressure (it is used to treat hypertension), sedation (lethargy), and a very common side effect of dry mouth (xerostomia). It does not cause bronchoconstriction or asthma exacerbation; those are classic risks associated with non-selective beta-blockers, not alpha-2 agonists.

Loop diuretics inhibit the \(Na^+\)/\(K^+\)/\(2Cl^-\) co-transporter in the thick ascending limb of the loop of Henle. This leads to significantly increased excretion of sodium, potassium, and chloride. The loss of potassium and hydrogen ions often results in hypokalaemic metabolic alkalosis. Hypotension is also a common side effect due to the massive reduction in fluid volume. While nausea can occur with many medications, it is not a hallmark or specific side effect of the loop diuretic class compared to the profound electrolyte and fluid imbalances.

Isoflurane is a halogenated ether used for the induction and maintenance of general anaesthesia. Like most volatile anaesthetics, it causes respiratory depression and can increase cerebral blood flow by causing vasodilation in the brain. Post-operative nausea is a common side effect of anaesthetic gases. However, Isoflurane does not cause a rise in blood lipid levels; that characteristic is more famously associated with the intravenous anaesthetic Propofol, which is delivered in a lipid emulsion.

Midazolam is a short-acting benzodiazepine used primarily for conscious sedation. It is highly effective at inducing anterograde amnesia (the patient doesn't remember the procedure) and can cause dizziness and respiratory depression. While it is used for sedation, it is not a true 'anaesthetic' on its own; it does not provide analgesia (pain relief) or the full depth of unconsciousness required for surgery without being part of a larger drug cocktail. (Note: While 'd' was the provided answer, in clinical terms, Midazolam is a sedative, not a complete anaesthetic).

Clozapine is a potent antipsychotic reserved for treatment-resistant schizophrenia. Its most dangerous side effect is agranulocytosis (a severe drop in white blood cell count), requiring strict blood monitoring. It is also strongly associated with significant weight gain and metabolic changes due to increased appetite. Therefore, 'increased appetite' IS a well-known effect; the prompt's provided answer 'd' is likely an error in the source material as 'agranulocytosis' is the specific reason it is a restricted drug.

Epinephrine is a sympathomimetic that acts on both alpha and beta receptors. It is used to treat acute asthma (bronchodilation), hypotension (vasoconstriction), and anaphylaxis. It is also used in some eye drops to treat open-angle glaucoma by reducing aqueous humour production. It has no therapeutic role in the management of primary renal disease, where it might actually decrease renal blood flow through vasoconstriction.

Ephedrine is commonly used as a decongestant and to treat hypotension associated with anaesthesia. It can also be used to treat urinary incontinence due to its effect on the bladder sphincter. While it has bronchodilatory properties, it is not a standard or primary treatment for Chronic Obstructive Pulmonary Disease (COPD), which is typically managed with inhaled bronchodilators like salbutamol or anticholinergics like ipratropium.

The suffix '-tidine' identifies Histamine H2-receptor antagonists. These drugs work by blocking the action of histamine on the parietal cells of the stomach, thereby reducing the secretion of gastric acid. They are widely used in the treatment of peptic ulcers and Gastro-oesophageal Reflux Disease (GERD).

The suffix '-navir' is standard for Protease inhibitors, which are a class of antiviral drugs used primarily in the treatment of HIV/AIDS. These drugs block the viral protease enzyme, preventing the virus from processing its proteins and creating mature, infectious virions. (Note: The provided answer 'b' is correct, though the options in the prompt were slightly combined).

Tetracycline antibiotics are well-known for causing phototoxic reactions. When the drug is present in the skin, exposure to sunlight (UVA) can cause a reaction that results in painful, red rashes or severe blistering that looks like an exaggerated sunburn. Patients taking tetracyclines are strictly advised to use high-SPF sunscreen and avoid prolonged sun exposure.