L-MTX is a second-generation tau protein aggregation inhibitor. It acts by reducing levels of aggregated or misfolded tau proteins, which are associated with the progressive neurodegeneration. It is currently under development for the treatment of Alzheimer’s disease.

Trigonellamide (1-Methylnicotinamide) is a metabolite of nicotinamide and is produced primarily in the liver by nicotinamide N-methyltransferase. Trigonellamide may be an endogenous activator of prostacyclin (PGI2) production and thus may regulate thrombotic as well as inflammatory processes in the cardiovascular system. The mechanisms of action of Trigonellamide involve the activation of PGI2 release driven by cyclooxygenase 2 (COX-2). PGI2 releasing capacity of 1- Trigonellamide was shown to afford not only anti-thrombotic but also fibrinolytic, anti-inflammatory and gastroprotective effects. Interestingly, Trigonellamide did not directly either affect the activity of leucocytes or release PGI2 in the perfused rat hindquarters model. Still, Trigonellamide, due to its PGI2 releasing capacity, might serve as a hepatoprotective agent that protects against Concanavalin-A induced liver injury through the downregulation of interleukin-4 (IL-4) and tumor necrosis factor-α signalization (TNF-α). In addition to its anti-platelet, anti-thrombotic and anti-inflammatory activities, 1-MNA has also been shown to restore endothelial function in diabetic hyperglycemic rats, as well as to improve endothelial function in humans. PGI2 displays anti-metastatic activity, and the PGI2 releasing activity of Trigonellamide, the potential application of exogenous Trigonellamide to prevent metastatic cancer.

7-Methylxanthine is a methyl derivative of xanthine, found occasionally in human urine. 7-Methylxanthine is one of the purine components in urinary calculi. 7-methylxanthine (7-MX) is a metabolite of caffeine and theobromine, and has been shown to have low toxicity and no carcinogenic effects. 7-MX is known as a non-selective adenosine antagonist and has been shown to work against myopia. 7-MX has little effect on the proliferation or apoptosis of human RPE cells; however, 7-MX disturbs the proportion of cells in the G1 stage and inhibits the expression of ADORA1, ADORA2A, and ADORA2B in short-term treatment. 7-MX has been confirmed to reduce the severity of myopia and eye elongation induced by forming deprivation in guinea pigs and to counteract the thinning of the posterior sclera and of collagen fibrils induced by form deprivation. A clinical trial showed that 7-MX reduced eye elongation and myopia progression in childhood myopia.

5-Methoxytryptamine (aka 5-MT, mexamine) is a tryptamine derivative closely related to the neurotransmitters serotonin and melatonin. 5-MT is produced endogenously at low levels; it is biosynthesized by deacetylation of melatonin in the pineal gland. 5-MT acts as a full agonist at the 5-HT1, 5-HT2, 5-HT4, 5-HT6, and 5-HT7 receptors. It is often used as a chemical probe in the study of serotonin receptors, but it has also been used in a clinical trial to mitigate the anemic effects of cisplatin chemotherapy.

Ufiprazole (Omeprazole sulfide) is a metabolite of Omeprazole, which is a proton pump inhibitor. Omeprazole sulfide has been shown to be a direct-acting inhibitor of CYP2C19 in pooled human liver microsomes. Ufiprazole is also a weak BRS-3 agonist.

Hydromorphinol, an opioid, and is a derivative of morphine and possesses similar properties: sedation, analgesia, and respiratory depression. Hydromorphinol is under the control according to US Single Convention 1961.

Taleranol (also known as P-1560) a weak estrogen and a minor metabolite and epimer of the drug, zeranol. Zeranol is an anabolic agent that used in animal feed and is intended for human consumption, is noncarcinogenic, nonteratogenic, and nonmutagenic.

Canbisol is dihydroxyhexahydrodibenzo(b,d)pyran derivative patented by pharmaceutical company Eli Lilly and Co. as antihypertensive agent. At the dosages studied, Canbisol reduced food consumption by rats.

Carabestine is the active first-pass metabolite of Ebastine and acts as a histamine H1 receptor antagonist which has been investigated as a potential allergy medication. Ebastine is marketed under a number of brand names.