Question 1

How does cytisine from Laburnum work for smoking cessation?

Accepted Answer

Cytisine acts as a partial agonist at nicotinic acetylcholine receptors, particularly the α4β2 subtype in the brain. It binds to the same receptors as nicotine but produces a weaker stimulating effect, which reduces nicotine cravings and withdrawal symptoms while simultaneously blocking nicotine from binding. This dual mechanism is similar to varenicline (Chantix), which was synthetically developed based on cytisine's molecular structure. Evidence Level: C.

Question 2

What are the drug interactions with cytisine or Laburnum?

Accepted Answer

Cytisine should not be combined with varenicline due to their similar mechanisms of action at nicotinic receptors, as this could increase adverse effects. Caution is advised when used alongside cardiovascular medications, as cytisine can affect blood pressure and heart rate. The plant itself contains multiple toxic alkaloids including sparteine and anagyrine, which can cause unpredictable interactions. Only pharmaceutical-grade cytisine should be considered, never raw plant material. Evidence Level: C.

Question 3

What is the correct dosage of cytisine for smoking cessation?

Accepted Answer

Pharmaceutical cytisine is typically administered at 1.5-9 mg daily following a graduated dosing schedule over 25 days, with higher doses initially that taper progressively. However, the raw Laburnum plant must NEVER be used for self-medication—all parts are highly toxic and contain variable, unpredictable concentrations of cytisine and other dangerous alkaloids. Only standardized pharmaceutical preparations under medical supervision are appropriate. Evidence Level: C.

Question 4

Is Laburnum safe during pregnancy or breastfeeding?

Accepted Answer

No. Laburnum is absolutely contraindicated during pregnancy and breastfeeding. All plant parts contain cytisine, anagyrine, and other quinolizidine alkaloids that readily cross the placenta and can cause fetal harm, uterine contractions, and potential fetal death. Anagyrine has documented teratogenic effects in livestock. Pharmaceutical cytisine is similarly contraindicated in pregnancy. The plant's severe toxicity profile makes any exposure during pregnancy extremely dangerous. Evidence Level: C.

Question 5

Is Laburnum anagyroides poisonous to humans and pets?

Accepted Answer

Yes, extremely poisonous. All parts of Laburnum anagyroides—seeds, leaves, bark, flowers, and roots—contain cytisine and other toxic alkaloids. Ingestion causes severe vomiting, abdominal pain, drowsiness, seizures, respiratory failure, and potentially death. As little as one seed can be fatal to a child. Pets, particularly dogs and horses, are also highly susceptible to poisoning. Immediate emergency medical attention is essential if any part of this plant is ingested. Evidence Level: C.

Laburnum anagyroides

Sources & Citations

Summary

Background

Active compounds

Mechanism of action

Clinical evidence

Safety & adverse effects

Evidence summary

PubMed sources

Government sources