Clinical data | |
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Trade names | Visken, others [1] |
AHFS/Drugs.com | Monograph |
MedlinePlus | a684032 |
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Routes of administration | By mouth, intravenous |
ATC code | |
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Pharmacokinetic data | |
Bioavailability | 50% to 95% |
Metabolism | Hepatic |
Elimination half-life | 3–4 hours |
Excretion | Renal |
Identifiers | |
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CAS Number | |
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IUPHAR/BPS | |
DrugBank | |
ChemSpider | |
UNII | |
KEGG | |
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ChEMBL | |
CompTox Dashboard (EPA) | |
ECHA InfoCard | 100.033.501 |
Chemical and physical data | |
Formula | C14H20N2O2 |
Molar mass | 248.326 g·mol−1 |
3D model (JSmol) | |
Chirality | Racemic mixture |
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Pindolol, sold under the brand name Visken among others, is a nonselective beta blocker which is used in the treatment of hypertension. [1] [2] It is also an antagonist of the serotonin 5-HT1A receptor, preferentially blocking inhibitory 5-HT1A autoreceptors, and has been researched as an add-on therapy to various antidepressants, such as clomipramine and the selective serotonin reuptake inhibitors (SSRIs), in the treatment of depression [3] [4] [5] and obsessive-compulsive disorder. [6] [7]
Pindolol is used for hypertension in the United States, Canada, and Europe, and also for angina pectoris outside the United States. [2] When used alone for hypertension, pindolol can significantly lower blood pressure and heart rate, but the evidence base for its use is weak as the number of subjects in published studies is small. [2] In some countries, pindolol is also used for arrhythmias and prophylaxis of acute stress reactions.[ medical citation needed ]
Similar to propranolol with an extra contraindication for hyperthyroidism. In patients with thyrotoxicosis, possible deleterious effects from long-term use of pindolol have not been adequately appraised. Beta-blockade may mask the clinical signs of continuing hyperthyroidism or complications, and give a false impression of improvement. Therefore, abrupt withdrawal of pindolol may be followed by an exacerbation of the symptoms of hyperthyroidism, including thyroid storm. [8]
Pindolol has intrinsic sympathomimetic activity and is therefore used with caution in angina pectoris. [8]
Site | Ki (nM) | Species | Ref |
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5-HT1A | 15–81 | Human | [10] [11] [12] |
5-HT1B | 4,100 34–151 | Human Rodent | [11] [9] [13] [14] |
5-HT1D | 4,900 | Human | [11] |
5-HT1E | >10,000 | Human | [15] |
5-HT1F | >10,000 | Human | [16] |
5-HT2A | 9,333 | Human | [17] |
5-HT2B | 2,188 | Human | [17] |
5-HT2C | >10,000 | Human | [17] |
5-HT3 | ≥6,610 | Multiple | [18] [19] [20] |
5-HT4 | >10,000 ? | Rat | [21] |
5-HT5B | >1,000 | Rat | [22] |
5-HT6 | >10,000 (–) | Mouse | [23] |
5-HT7 | >10,000 | Human | [24] [25] |
α1 | 7,585 | Pigeon | [18] |
α2 | ND | ND | ND |
β1 | 0.52–2.6 | Human | [12] [26] |
β2 | 0.40–4.8 | Human | [12] [26] |
β3 | 44 | Human | [26] [27] |
D2-like | >10,000 | Rat | [28] |
D2 | >10,000 | Pigeon | [18] |
D3 | >10,000 | Pigeon | [18] |
M1 | ? | ? | |
Values are Ki (nM), unless otherwise noted. The smaller the value, the more strongly the drug binds to the site. |
Pindolol is a first generation, [29] non-selective beta blocker in the class of β-adrenergic receptor antagonists. On the receptor level it is a competitive partial agonist. It possesses intrinsic sympathomimetic activity, meaning it has some degree of agonist effects in the absence of competing ligands. Pindolol shows membrane-stabilizing effects like quinidine, possibly accounting for its antiarrhythmic effects. It also acts as a serotonin 5-HT1A receptor partial agonist (intrinsic activity = 20–25%) or functional antagonist. [30]
Pindolol is rapidly and well absorbed from the GI tract. It undergoes some first-pass-metabolization leading to an oral bioavailability of 50-95%. Patients with uremia may have a reduced bioavailability. Food does not alter the bioavailability, but may increase the resorption. Following an oral single dose of 20 mg peak plasma concentrations are reached within 1–2 hours. The effect of pindolol on pulse rate (lowering) is evident after 3 hours. Despite the rather short halflife of 3–4 hours, hemodynamic effects persist for 24 hours after administration. Plasma halflives are increased to 3–11.5 hours in patients with renal impairment, to 7–15 hours in elderly patients, and from 2.5 to 30 hours in patients with liver cirrhosis. Approximately 2/3 of pindolol is metabolized in the liver giving hydroxylates, which are found in the urine as gluconurides and ethereal sulfates. The remaining 1/3 of pindolol is excreted in urine in unchanged form.
Pindolol was patented by Sandoz in 1969 and was launched in the US in 1977. [31] Towards end of February 2020 FDA added this product to their "DRUG SHORTAGE" list stating this is due to "Shortage of an active ingredient" and this is likely to be related to Coronavirus outbreak and related supply chain impacts.
Pindolol has been investigated as an add-on drug to antidepressant therapy with SSRIs like fluoxetine in the treatment of depression since 1994. [32] [5] The rationale behind this strategy has its basis in the fact that pindolol is an antagonist of the serotonin 5-HT1A receptor. [4] Presynaptic and somatodendritic 5-HT1A receptors act as inhibitory autoreceptors, inhibit serotonin release, and are pro-depressive in their action. [4] This is in contrast to postsynaptic 5-HT1A receptors, which mediate antidepressant effects. [4] By blocking 5-HT1A autoreceptors at doses that are selective for them over postsynaptic 5-HT1A receptors, pindolol may be able to disinhibit serotonin release and thereby improve the antidepressant effects of SSRIs. [4] The results of augmentation therapy with pindolol have been encouraging in early studies of low quality. [3] A 2015 systematic review and meta-analysis of five randomized controlled trials found no overall significant benefit at 2.5 mg although, with regard to patients with SSRI-resistant depression, "once-daily high-dose pindolol (7.5 mg qd) appears to show a promising benefit in these patients". [5] On the other hand, a 2017 systematic review indicated that pindolol's efficacy has been demonstrated in high evidence studies. [33] Initiating pharmacotherapy with an SSRI plus pindolol might accelerate the SSRI's therapeutic impact. [4] [33] Pindolol's antidepressive efficacy may predominantly result from its ability to desensitize 5-HT1A autoreceptors. [34]
5-HT receptors, 5-hydroxytryptamine receptors, or serotonin receptors, are a group of G protein-coupled receptor and ligand-gated ion channels found in the central and peripheral nervous systems. They mediate both excitatory and inhibitory neurotransmission. The serotonin receptors are activated by the neurotransmitter serotonin, which acts as their natural ligand.
Azapirones are a class of drugs used as anxiolytics, antidepressants, and antipsychotics. They are commonly used as add-ons to other antidepressants, such as selective serotonin reuptake inhibitors (SSRIs).
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The serotonin 1A receptor is a subtype of serotonin receptors, or 5-HT receptors, that binds serotonin, also known as 5-HT, a neurotransmitter. 5-HT1A is expressed in the brain, spleen, and neonatal kidney. It is a G protein-coupled receptor (GPCR), coupled to the Gi protein, and its activation in the brain mediates hyperpolarization and reduction of firing rate of the postsynaptic neuron. In humans, the serotonin 1A receptor is encoded by the HTR1A gene.
5-hydroxytryptamine receptor 1B also known as the 5-HT1B receptor is a protein that in humans is encoded by the HTR1B gene. The 5-HT1B receptor is a 5-HT receptor subtype.
8-OH-DPAT is a research chemical of the aminotetralin chemical class which was developed in the 1980s and has been widely used to study the function of the 5-HT1A receptor. It was one of the first major 5-HT1A receptor full agonists to have been discovered.
5-Hydroxytryptamine (serotonin) receptor 5A, also known as HTR5A, is a protein that in humans is encoded by the HTR5A gene. Agonists and antagonists for 5-HT receptors, as well as serotonin uptake inhibitors, present promnesic (memory-promoting) and/or anti-amnesic effects under different conditions, and 5-HT receptors are also associated with neural changes.
The 5-HT7 receptor is a member of the GPCR superfamily of cell surface receptors and is activated by the neurotransmitter serotonin (5-hydroxytryptamine, 5-HT). The 5-HT7 receptor is coupled to Gs (stimulates the production of the intracellular signaling molecule cAMP) and is expressed in a variety of human tissues, particularly in the brain, the gastrointestinal tract, and in various blood vessels. This receptor has been a drug development target for the treatment of several clinical disorders. The 5-HT7 receptor is encoded by the HTR7 gene, which in humans is transcribed into 3 different splice variants.
WAY-100635 is a piperazine drug and research chemical widely used in scientific studies. It was originally believed to act as a selective 5-HT1A receptor antagonist, but subsequent research showed that it also acts as potent full agonist at the D4 receptor. It is sometimes referred to as a silent antagonist at the former receptor. It is closely related to WAY-100135.
Robalzotan is a selective antagonist at the 5-HT1A receptor. It was shown to completely reverse the autoreceptor-mediated inhibition of serotonin release induced by the administration of selective serotonin reuptake inhibitors like citalopram in rodent studies. It was subsequently investigated by AstraZeneca as a potential antidepressant but like many other 5-HT1A ligands was discontinued. Later on it was researched for other indications such as irritable bowel syndrome but was dropped once again.
S-15535 is a phenylpiperazine drug which is a potent and highly selective 5-HT1A receptor ligand that acts as an agonist and antagonist at the presynaptic and postsynaptic 5-HT1A receptors, respectively. It has anxiolytic properties.
Befiradol is an experimental drug being studied for the treatment of levodopa-induced dyskinesia. It is a potent and selective 5-HT1A receptor full agonist.
Serotonin antagonist and reuptake inhibitors (SARIs) are a class of drugs used mainly as antidepressants, but also as anxiolytics and hypnotics. They act by antagonizing serotonin receptors such as 5-HT2A and inhibiting the reuptake of serotonin, norepinephrine, and/or dopamine. Additionally, most also antagonize α1-adrenergic receptors. The majority of the currently marketed SARIs belong to the phenylpiperazine class of compounds.
Roxindole (EMD-49,980) is a dopaminergic and serotonergic drug which was originally developed by Merck KGaA for the treatment of schizophrenia. In clinical trials its antipsychotic efficacy was only modest but it was unexpectedly found to produce potent and rapid antidepressant and anxiolytic effects. As a result, roxindole was further researched for the treatment of depression instead. It has also been investigated as a therapy for Parkinson's disease and prolactinoma.
F-15,599, also known as NLX-101, is a potent and selective 5-HT1A receptor full agonist. In addition, it displays functional selectivity, or biased agonism, by preferentially activating postsynaptic serotonin 5-HT1A receptors over somatodendritic serotonin 5-HT1A autoreceptors. The drug has been investigated for potential use as a pharmaceutical drug in the treatment of conditions including depression, schizophrenia, cognitive disorders, Rett syndrome, and fragile X syndrome.
Osemozotan (MKC-242) is a selective 5-HT1A receptor agonist with some functional selectivity, acting as a full agonist at presynaptic and a partial agonist at postsynaptic 5-HT1A receptors. 5-HT1A receptor stimulation influences the release of various neurotransmitters including serotonin, dopamine, norepinephrine, and acetylcholine. 5-HT1A receptors are inhibitory G protein-coupled receptor.
A serotonin modulator and stimulator (SMS), sometimes referred to more simply as a serotonin modulator, is a type of drug with a multimodal action specific to the serotonin neurotransmitter system. To be precise, SMSs simultaneously modulate one or more serotonin receptors and inhibit the reuptake of serotonin. The term was created to describe the mechanism of action of the serotonergic antidepressant vortioxetine, which acts as a serotonin reuptake inhibitor (SRI), agonist of the 5-HT1A receptor, and antagonist of the 5-HT3 and 5-HT7 receptors. However, it can also technically be applied to vilazodone, which is an antidepressant as well and acts as an SRI and 5-HT1A receptor partial agonist.
Selective serotonin reuptake inhibitors, or serotonin-specific re-uptake inhibitor (SSRIs), are a class of chemical compounds that have application as antidepressants and in the treatment of depression and other psychiatric disorders. SSRIs are therapeutically useful in the treatment of panic disorder (PD), posttraumatic stress disorder (PTSD), social anxiety disorder, obsessive-compulsive disorder (OCD), premenstrual dysphoric disorder (PMDD), and anorexia. There is also clinical evidence of the value of SSRIs in the treatment of the symptoms of schizophrenia and their ability to prevent cardiovascular diseases.
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