The present invention features methods for treating, stabilizing, preventing, and/or delaying pulmonary hypertension by administering nanoparticles that comprise rapamycin or a derivative thereof and/or nanoparticles that comprise a taxane (e.g., paclitaxel) or a derivative thereof. The invention also provides compositions (e.g., unit dosage forms) comprising nanoparticles that comprise a carrier protein and rapamycin or a derivative thereof and/or nanoparticles that comprise a carrier protein and a taxane (e.g., paclitaxel) or a derivative4 thereof.
