Drug Mnemonic

Paclitaxel

Antineoplastic • microtubule stabilizer • Breast/Ovarian Cancer
April 20, 2026

A story built from the name paclitaxel itself - so the mechanism of action, key side effects, and the way Step 1 actually tests it stick on the first read.

RxMnemonic Antineoplastics
Paclitaxel
Antineoplastic • microtubule stabilizer • Breast/Ovarian Cancer
PACLI = park + TAXEL = taxi
Separate paclitaxel into PACLI (sounds like park) and TAXEL (sounds like taxi). Imagine that you're on the sidewalk, trying to wave down a taxi. After 10 minutes, you are now angry and put your hand out at the taxi trying to freeze it in place, saying PARK (PACLI) THE TAXI (TAXEL)!! Just like you're freezing this taxi in place, paclitaxel stabilizes microtubules by freezing them in place.
Paclitaxel pharmacology mnemonic illustration
Antineoplastic PACLI = park | TAXEL = taxi
HOW STEP TESTS IT
1
Paclitaxel stabilizes microtubules, preventing mitosis in dividing cancer cells. It functions in the opposite manner of vincristine/vinblastine, which prevent microtubule polymerization.
2
Paclitaxel side effects - peripheral neuropathy and alopecia (waiting for a taxi really gets on your nerves and makes you pull your hair out).
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Practice Question

Paclitaxel allows spindle formation but prevents its normal dynamic breakdown. Which phase is most likely affected?

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Pharmacology Summary

Paclitaxel: Mechanism, Uses & High-Yield Facts for USMLE Step 1

Paclitaxel is a taxane antineoplastic that stabilizes microtubules by preventing depolymerization, locking cells in M phase and blocking mitotic division. This is the opposite of vinca alkaloids like vincristine, which prevent microtubule polymerization. Paclitaxel is used for breast and ovarian cancers. Key side effects on boards are peripheral neuropathy and alopecia.

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