Cytisine is an alkaloid extracted from legumes, primarily from Thermopsis lanceolata and Sophora alopecuroides. As a partial agonist of the α4β2 nicotinic acetylcholine receptor, cytisine competitively binds to nicotine receptors, demonstrating significant efficacy and good safety in helping smokers quit nicotine. It is expected that Cytisinicline will receive FDA approval in 2026, leading to wider global clinical application.This article will provide medical professionals and potential customers with information on cytisine, especially key issues such as dosage, contraindications, and drug interactions.
As a professional cytisine raw material manufacturer, KINTAIBIO® is committed to providing customers with high-purity (99% HPLC) cytisine powder. Our products utilize advanced extraction processes and meet international standards. If you are looking for a cytisine supplier or factory, please contact us at sales@kintaibio.com.
How to take cytisine?
Standardized 25-day dosing regimen
| Treatment Days | Dosage Frequency | Daily Dosage (at 1.5 mg/unit) | Remarks | ||||||
| Days 1-3 | every 2 hours | 6 tablets | Initial loading dose | ||||||
| Days 4-12 | every 2.5 hours | 5 tablets | Target quit date set on day 5 | ||||||
| Days 13-16 | every 3 hours | 4 tablets | Gradual dose reduction | ||||||
| Days 17-20 | every 4-5 hours | 3 tablets | Gradual dose reduction | ||||||
| Days 21-25 | every 6 hours (1-2 times) | 2 tablets | Maintenance dose | ||||||
ORCA-2 Clinical Trial
The ORCA-2 randomized controlled trial, published in JAMA in 2023, evaluated a novel pharmacokinetic-based dosing regimen. This was a three-group, double-blind, randomized controlled trial that included 810 daily smokers, comparing the efficacy of a 6-week or 12-week treatment regimen (3 mg three times daily) with placebo.
Source:https://pubmed.ncbi.nlm.nih.gov
Results showed that the 6-week treatment group achieved a biochemically validated rate of continued smoking cessation of 25.3% in the last four weeks of treatment (weeks 3-6), significantly higher than the 4.4% in the placebo group. The 12-week treatment group achieved a rate of continued smoking cessation of 32.6% in the last four weeks of treatment (weeks 9-12), significantly higher than the 7.0% in the placebo group.
This indicates that, in addition to the classic 25-day regimen, longer treatment courses (6-12 weeks) also demonstrate excellent efficacy and tolerability, providing more options for smokers with different needs.
Cytisine Drug Interactions
Sparteine powder is primarily excreted unchanged via the kidneys and is almost entirely bypassed by the hepatic CYP450 enzyme system; therefore, the risk of drug interactions mediated by CYP enzymes is low. However, the following types of drug interactions still require attention:
- With nicotine and NRT products: Theoretically, concurrent use with nicotine replacement therapy or other smoking cessation medications (such as varenicline) may increase the risk of side effects (such as nausea and palpitations) due to similar mechanisms of action, and should be avoided.
- With antiretroviral drugs: A 2024 case report showed that no adverse events or changes in viral load were observed when Cytisinicline powder was used in combination with HIV drugs such as bicretiva. This suggests that the likelihood of clinically significant interactions with antiretroviral drugs metabolized by CYP450 enzymes is low.
- With antiepileptic drugs: Animal studies have shown that Sophora Alopecuroides Extract Cytisine may inhibit the activity of certain antiepileptic drugs (such as phenytoin, lamotrigine, and levetiracetam), and caution should be exercised when using it clinically.
- With hormonal contraceptives: It is recommended that women of childbearing age use highly effective contraception while taking this medication. For those using systemic hormonal contraceptives, it is recommended to use an additional barrier method of contraception to ensure contraceptive efficacy.
- With varenicline: Both are partial α4β2 receptor agonists with highly similar mechanisms of action, and should be avoided when used together.
Cytisine contraindications
Absolute contraindications
- Pregnant and lactating women: Because nicotine receptors are present in the early stages of human fetal brain development and safety data are lacking, Thermopsis Lanceolata Extract cytisine is contraindicated during pregnancy and lactation.
- Patients with serious illnesses: Contraindicated in patients with unstable angina, recent myocardial infarction, clinically significant arrhythmias, recent stroke, advanced atherosclerosis, and uncontrolled hypertension.
Warning Signs
- Severe Kidney Impairment: Because the drug is primarily excreted through the kidneys, it is contraindicated in patients with severe kidney damage.
- Mental Illness: The smoking cessation process itself may be associated with mood changes; patients with severe mental health problems should use it under close medical supervision.
- Epilepsy: Contraindicated in patients diagnosed with epilepsy.
Cytisine and Alcohol
Multiple animal studies have shown that cytisine can significantly reduce alcohol consumption and the "alcohol deprivation effect" (a relapse model) in mice, indicating its potential in treating alcohol use disorder.Alcohol and nicotine both activate the same nicotinic acetylcholine receptors (especially the α4β2 subtype) in brain reward pathways (such as the ventral tegmental area). As a partial agonist of this receptor, Sparteine powder may alleviate cravings for both nicotine and alcohol by modulating this pathway.
Currently, the primary indication for sparteine sulfate remains smoking cessation. Its use in treating alcohol dependence is still in the research stage and has not been formally approved. It is recommended to avoid or strictly limit alcohol intake while taking Sophora Alopecuroides Extract Cytisine.
Cytisine Adverse Reactions
Common adverse reactions:Include changes in appetite, dizziness, irritability, mood changes, anxiety, sleep disturbances, headache, tachycardia, hypertension, dry mouth, nausea, heartburn, constipation, rash, myalgia, and fatigue.
Most reactions are mild
These reactions are usually mild to moderate and transient, and some symptoms may be related to nicotine withdrawal itself.
where to buy cytisine powder?
Cytisinicline, with its well-defined pharmacological mechanism, standardized dosage regimens, and continuously updated high-level clinical evidence, has become a cost-effective and safe smoking cessation medication option. Its unique pharmacokinetic properties contribute to a lower risk of drug interactions.
As the manufacturer, KINTAIBIO® produces cytisine powder derived from Thermopsis lanceolata/Sophora alopecuroides with a purity of up to 99%. We are committed to providing high-quality Thermopsis Lanceolata Extract and continuously promoting science-based clinical application guidelines. We recommend that healthcare professionals fully assess patients' contraindications and concomitant medications when prescribing, select appropriate dosing regimens, and strengthen patient education and follow-up to maximize therapeutic effects. Please feel free to contact us at sales@kintaibio.com for pricing and product information.
