Letrozole and MK-677 Interaction

Avoid
Mechanism-based 64% confidence

Letrozole and MK-677 have a potentially harmful interaction with 64% confidence. Both Letrozole and MK-677 carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently. Both compounds affect the pituitary, so monitoring these systems is recommended.

Compound Profiles

Letrozole

Aromatase Inhibitor | Potent Estrogen Suppression

Letrozole competitively and reversibly binds to the heme group of the aromatase enzyme (cytochrome P450 19A1), inhibiting its catalytic activity with greater potency than any other commercially available aromatase inhibitor. Aromatase catalyzes the final step in estrogen biosynthesis, converting testosterone to estradiol and androstenedione to estrone in peripheral tissues including adipose, muscle, liver, and brain.

Half-life: ~2 days (48 hours) Typical dose: 0.25-0.5mg EOD (on-cycle); 2.5mg/day (medical) pct, anabolic
aromatase androgenicaromatase inhibitorhepatotoxichpta suppressive
View full profile

MK-677

Ghrelin Receptor Agonist | Oral Growth Hormone Secretagogue

Selectively binds GHS-R1a receptors in hypothalamus and pituitary, triggering pulsatile growth hormone release while maintaining natural circadian patterns..

Half-life: ~24 hours Typical dose: Start 12.5mg daily, increase to 25mg based on tolerance growth hormone, weight loss, sleep
ghrelin receptor blood pressure raisingcarcinogenic riskhepatotoxicinsulin disrupting
View full profile

Combined Organ Load

Gonads
moderate
Liver
moderate
Heart
low
Pituitary
low
Brain
low
GI Tract
low

Shared Safety Flags

2x 2 hepatotoxic compounds (Letrozole, MK-677). Liver damage risk significantly increased. Include liver support (TUDCA/NAC) and monitor ALT/AST.
2x 2 compounds share the teratogenic safety flag (Letrozole, MK-677). Monitor accordingly.

Frequently Asked Questions

Can I take Letrozole with MK-677?

Combining Letrozole with MK-677 is not recommended. Both Letrozole and MK-677 carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently.

Is Letrozole and MK-677 safe together?

This combination carries significant risk. Both Letrozole and MK-677 carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently. Consult a healthcare professional before combining.

What are the interactions between Letrozole and MK-677?

Both Letrozole and MK-677 carry hepatotoxic risk. Combining hepatotoxic compounds significantly increases liver damage potential. If unavoidable, include liver support (TUDCA/NAC) and monitor ALT/AST frequently. This assessment has 64% confidence and is inferred from pharmacological mechanism analysis.

How should I time Letrozole and MK-677?

Letrozole has a half-life of ~2 days (48 hours) and MK-677 has a half-life of ~24 hours. No specific timing requirements identified for this combination, but separating administration can help monitor individual effects.

Check this pair in the full Interaction Checker Full comparison: Letrozole vs MK-677

This interaction analysis is compiled from research literature and pharmacological mechanism data. This assessment is inferred from known mechanisms and may not reflect all real-world outcomes. Always consult a healthcare professional before combining compounds.