Guessing the substance his wife used, Flambeau gives Brown clues as to the antidote, Prussian Blue. In S6:E9 of Elementary, entitled "Nobody Lives Forever" (2018), a biology professor studying how to prolong life spans is poisoned with thallium. As he dies, he falls onto a shelf containing his lab rats, which escape and eventually eat part of his body. Some dead rats are found inside him, suggesting to the detectives that the cause of death was poisoning. References
External links

"Thallium, elemental". National Institutes of Health. NLM hazardous substances databank. U.S. Department of Health and Human Services. Curley, Robert. "Cyril Wecht, Thallium". crimelibrary.com. Archived from the original on 17 April 2008. "ToxFAQs". Centers for Disease Control. ATSDR. U.S. Department of Health and Human Services. "Two Iraqi children die from Thallium poisoning". The Guardian. reports. 9 February 2008.
Esmolol, sold under the brand name Brevibloc, is a cardio selective beta1 receptor blocker with rapid onset, a very short duration of action, and no significant intrinsic sympathomimetic or membrane stabilising activity at therapeutic dosages. It is a class II antiarrhythmic. Esmolol decreases the force and rate of heart contractions by blocking beta-adrenergic receptors of the sympathetic nervous system, which are found in the heart and other organs of the body. Esmolol prevents the action of two naturally occurring substances: epinephrine and norepinephrine.It was patented in 1980 and approved for medical use in 1987. Medical uses
To terminate supraventricular tachycardia,
Episodic atrial fibrillation or flutter,
Arrhythmia during anaesthesia,
To reduce HR and BP during and after cardiac surgery, and
In early treatment of myocardial infarction. Esmolol is also used in blunting the hemodynamic response to laryngoscopy and intubation. Dosing
A loading dose of 0.5 mg/kg is given followed
by 0.05–0.2 mg/kg/min infusion. Metabolism
Esmolol is considered a soft drug, one that is rapidly metabolized to an inactive form. Esmolol is rapidly metabolized by hydrolysis of the ester linkage, chiefly by the esterases in the cytosol of red blood cells and not by plasma cholinesterases or red cell membrane acetylcholinesterase. Total body clearance in man was found to be about 20 L/kg/hr, which is greater than cardiac output; thus the metabolism of esmolol is not limited by the rate of blood flow to metabolizing tissues such as the liver or affected by hepatic or renal blood flow. Esmolols short duration of action is based on the ester-methyl side chain which allows for quick hydrolysis.