Diphenylmethanol ethers

Diphenhydramine, sold under the brand name Benadryl among others, is an antihistamine and sedative. Although generally considered sedating, diphenhydramine can cause paradoxical central nervous system stimulation in some individuals, particularly at higher doses. This may manifest as agitation, anxiety, or restlessness rather than sedation. It is a first-generation H1-antihistamine and it works by blocking certain effects of histamine, which produces its antihistamine and sedative effects. Diphenhydramine is also a potent anticholinergic. It is mainly used to treat allergies, insomnia, and sym

Clemastine, also known as meclastin, is a first-generation H1 histamine antagonist (antihistamine) with anticholinergic properties (drying) and sedative side effects. Like all first-generation antihistamines, it is sedating.

Ambrisentan, sold under the brand name Letairis among others, is a drug used for the treatment of pulmonary hypertension. It is an endothelin receptor antagonist.

Diphenylpyraline (DPP; sold as Allergen, Arbid, Belfene, Diafen, Hispril, Histyn, Lergobine, Lyssipol, Mepiben, Neargal) is a first-generation antihistamine with anticholinergic effects of the diphenylpiperidine class. It is marketed in Europe for the treatment of allergies. DPP has also been found to act as a dopamine reuptake inhibitor and produces hyperactivity in rodents. It has been shown to be useful in the treatment of Parkinsonism.

Darusentan (LU-135252; HMR-4005) is an endothelin receptor antagonist. Gilead Colorado, a subsidiary of Gilead Sciences, under license from Abbott Laboratories, is developing darusentan for the potential treatment of uncontrolled hypertension.

Etybenzatropine (INN), also known as ethybenztropine (USAN, BAN) and tropethydrylin, is a synthetic anticholinergic and antihistamine drug previously marketed under the trade names Panolid, Ponalid, and Ponalide for the treatment of Parkinson's disease and parkinsonism. Structurally related to benzatropine, etybenzatropine combines a tropane backbone with antihistaminic properties, acting primarily as a muscarinic acetylcholine receptor antagonist. It was used to alleviate motor symptoms such as tremor and rigidity but has been discontinued due to limited efficacy, significant side effects, an

Difluoropine (O-620) is a stimulant drug synthesised from tropinone, which acts as a potent and selective dopamine reuptake inhibitor. Difluoropine is unique among the tropane-derived dopamine reuptake inhibitors in that the active stereoisomer is the (S) enantiomer rather than the (R) enantiomer, the opposite way round compared to natural cocaine. It is structurally related to benztropine and has similar anticholinergic and antihistamine effects in addition to its dopamine reuptake inhibitory action.