Esmolol (trade name Brevibloc) is a cardioselective beta₁ receptor blocker with rapid onset, a very short duration of action, and no significant intrinsic sympathomimetic or membrane stabilising activity at therapeutic dosages.

Lobeline is a natural alkaloid found in "Indian tobacco" (Lobelia inflata), "Devil's tobacco" (Lobelia tupa), "cardinal flower" (Lobelia cardinalis), "great lobelia" (Lobelia siphilitica), and Hippobroma Longiflora. In its pure form it is a white amorphous powder which is freely soluble in water.

Varenicline (trade name Chantix in the USA and Champix in Europe and other countries, marketed by Pfizer, usually in the form of varenicline tartrate) is a prescription medication used to treat smoking addiction. Varenicline is a nicotinic receptor partial agonist. In this respect, it is similar to cytisine and different from nicotinic antagonist, bupropion, and nicotine replacement therapies (NRTs) like nicotine patches (commonly, "the patch") and nicotine gum. As a partial agonist, it both reduces cravings for and decreases the pleasurable effects of cigarettes and other tobacco products, and through these mechanisms, it can assist some patients in stopping smoking.

Hemicholinium-3 is a drug which blocks the reuptake of choline by the high affinity transporter ChT at the presynapse. The reuptake of choline is the rate limiting step in the synthesis of acetylcholine; hence, hemicholinium decreases the synthesis of acetylcholine. It is therefore classified as an acetylcholine antagonist.

Benztropine mesylate (INN: benzatropine mesilate; marketed as Cogentin) is an anticholinergic drug principally used for the treatment of:

Hexamethonium is a neuronal nAch (N_N) receptor antagonist which acts in autonomic ganglia by binding mostly in or on the N_N receptor, and not the acetylcholine binding site itself. It has no effect on the muscarinic acetylcholine receptors (mAChR) located on target organs of the parasympathetic nervous system, nor the nicotinic acetylcholine receptors at the neuromuscular junction (N_M) that are responsible for skeletal muscle motor response.

Betahistine hydrochloride is the generic name for the anti vertigo drug SERC. It was first registered in Europe in 1970 for the treatment of Ménière's disease. It is commonly prescribed for people who have balance disorders or to alleviate the vertigo symptoms associated with Ménière's disease.

Betazole is a H₂ receptor agonist. It is used clinically to test gastric secretory function.

Immepip is a histamine agonist.

Impromidine (INN) is a highly potent and specific histamine H₂ receptor agonist.