Ayurvedic Herb
Bacopa Monnieri
Strong EvidenceMultiple randomised double-blind trials and meta-analyses support a modest memory-acquisition and recall benefit at 300 mg/day of a standardised extract, with effects appearing only after 8-12 weeks.
Recommended Dose
300 mg standardized to 50% bacosides daily
Timing
Morning with a fatty meal for absorption
Mechanism of Action
Enhances synaptic communication via bacosides A and B, modulating serotonin, dopamine, and acetylcholine. Upregulates tryptophan hydroxylase and promotes dendritic branching.
Side Effects & Safety
Mild GI discomfort, nausea if taken on empty stomach. May cause drowsiness in some individuals. Onset of benefits takes 8-12 weeks.
Do not use / talk to a doctor first
- Bradycardia, or any condition worsened by increased cholinergic tone
- Gastrointestinal or urogenital tract obstruction, and peptic ulcer disease
- Asthma or chronic obstructive pulmonary disease
- Thyroid disease or on thyroid hormone medication
Interactions
Cholinergic drugs (acetylcholine, methacholine, bethanechol)
Additive cholinergic effect - Bacopa has cholinergic properties and may increase the chance of side effects
Source: StatPearls, Bacopa monnieri (NBK589635)
Anticholinergic drugs
Bacopa may counteract their effect by inhibiting acetylcholinesterase and raising acetylcholine
Source: StatPearls, Bacopa monnieri (NBK589635)
Drugs metabolised by CYP1A2, CYP2C9, CYP2C19 or CYP3A4
Bacopa inhibits these enzymes in vitro, so co-administered drug levels can rise; a documented case of cholinergic toxicity followed exactly this route with cevimeline
Source: Ramasamy 2014 (PMID 24566323); Acquarulo 2022, J Med Case Rep (PMID 35765109)
Thyroid hormone medication (e.g. levothyroxine)
Animal work reports roughly a 40% rise in T4; use cautiously or avoid with thyroid medication
Source: StatPearls, Bacopa monnieri (NBK589635)
Sedatives
Bacopa is mildly sedating, so sedative effects may add up
Source: StatPearls, Bacopa monnieri (NBK589635)
Pregnancy & breastfeeding
Safety in pregnancy and breastfeeding has not been established. The StatPearls monograph does not address it, and no controlled human data exist - treat that as unknown rather than reassuring, and avoid.
Who should avoid / see a doctor
Anyone on thyroid, cholinergic or anticholinergic medication, on a drug metabolised by CYP3A4/2C19/2C9/1A2, or with asthma, COPD, peptic ulcer, bradycardia or a GI/urinary obstruction. Stop and see a doctor if you develop sweating, excess salivation, cramping or a slow heartbeat. Men trying to conceive should note that animal work reports reduced sperm count, motility and viability at higher doses.
Synergies
Used in These Stacks
See Bacopa Monnieri inside a full protocol — the stack pages cover when and why to combine it.
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References
- 1.Ramasamy 2014, Evid Based Complement Alternat Med — At an estimated gut concentration of 600 ug/mL, Bacopa extract reduced CYP3A4, CYP2C9 and CYP2C19 catalytic activity to under 10% of control. (in vitro)
- 2.Acquarulo 2022, Journal of Medical Case Reports — Cholinergic toxicity in a patient taking cevimeline, attributed to Bacopa inhibiting the CYP enzymes that clear it; symptoms resolved after stopping the supplement. (single case report)
- 3.StatPearls, Bacopa monnieri — Contraindications, cholinergic and anticholinergic interactions, thyroid caution and the GI adverse-effect profile. (clinical reference monograph)
