Explanation:

The correct answer is "benzodiazepine," as lorazepam, also known as Ativan, is a benzodiazepine drug. Benzodiazepines act by increasing the efficacy of the neurotransmitter, GABA, when it acts upon its particular receptors. They have potent anti-anxiety properties, among other properties, and are frequently given during the initial phase of a panic attack to calm the patient.

On the other hand, the other choices are incorrect. Phenobarbital is an example of a barbiturate. Proproanolol is an example of a beta-blocker. Tamsulosin is an example of an alpha-blocker. Methamphetamine is an example of an amphetamine.

Explanation: Metoclopramide is an antiemetic and gastroprokinetic agent commonly used to treat nausea and vomiting, to facilitate gastric emptying in people with gastroparesis, and as a treatment for the gastric stasis often associated with migraine headaches.

Explanation:

5-fluouracil is a fluoropyrimidine analog which inhibits translation, synthesis, and function of RNA and DNA, thus slowing down cellular metabolism. It is used in treatment of colorectal, breast, and ovarian cancer, in addition to cancers of the GI and head and neck.

Explanation:

A direct bilirubin level of 2mg/dL or greater indicates acetaminophen toxicity.

Explanation:

Misoprostol is used for the prevention of non steroidal anti inflammatory drug (NSAID) induced gastric ulcers. Taking this drug will prevent gastric ulcers and relieve epigastric pain.

Explanation:

Fentanyl citrate comes in solid form on a stick (often referred to as a "fentanyl lollipop"). This form is 80-100 times more potent than morphine and intended for use by cancer patients and patients that have become tolerant to opioids. 

Explanation:

Celecoxib is a nonsteroidal anti-inflammatory drug (NSAID). These drugs work by inhibiting cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2), which reduces the synthesis of pro-inflammatory prostaglandins and thromboxane.

Explanation:

Naloxone antidotes opioid overdose by competitively binding to μ-opioid receptors. Flumazenil is an antidote to benzodiazepines. Glucagon is an antidote for beta blocker overdose. N-acetylcysteine is an antidote for acetaminophen.

Explanation:

Acetaminophen in doses over 3000mg per day can result in significant liver damage or liver failure. From 1998 to 2003, acetaminophen was the leading cause of acute liver failure in the United States. According to a population-based report in 2007 there are an estimated 1600 cases of acute liver failure in the United States every year, with acetaminophen being the most common etiology.

Explanation:

Levodopa (L-DOPA), a common treatment for Parkinson's disease, is generally given in combination with carbidopa or another peripheral dopa-decarboxylase inhibitor. This is because levodopa alone will stimulate dopamine receptors in the GI tract and the chemotrigger receptor zone (CTZ) in the brain, resulting in nausea, vomiting and anorexia. A peripheral dopa-decarboxylase inhibitor prevents levodopa from being prematurely converted into dopamine in the adrenal glands or other peripheral tissues.