Will my blood pressure increase after taking Mitotane?

Mitotane(Mitotane) has a profound impact on the hormone system in the body, especially its effect on the adrenal cortex, so patients may experience changes in endocrine function during long-term treatment. Increased blood pressure is one of the important issues that some patients with adrenal cancer are concerned about. However, it is not caused by drugs acting directly on blood vessels, but is closely related to the way hormones are regulated in the body.

The adrenal gland plays a key role in maintaining blood pressure, and the various hormones it secretes have regulatory effects on water and salt metabolism, vasoconstriction, and cardiac output. Mitotane will affect the synthesis of adrenocortical hormones, causing hormone deficiency in some patients. In order to maintain physiological balance, the body will initiate the regulation of other hormone pathways through related compensatory mechanisms, which may lead to blood pressure fluctuations. This change does not occur in everyone, but it is more obvious in some people who are sensitive to hormones.

In addition, mitotane needs to maintain a certain blood concentration for a long time, and this process may affect the electrolyte balance in the body. Changes in sodium and potassium levels are closely related to blood pressure, so when medications trigger metabolic adjustments, blood pressure may rise or fluctuate slightly. In overseas treatment guidelines, monitoring blood pressure, electrolytes and hormone levels is one of the routine requirements for mitotane treatment, in order to detect these potential changes early.

It is worth noting that the increase in blood pressure often does not appear suddenly, but gradually develops with the accumulation of drugs. If symptoms such as headache, chest tightness, rapid heartbeat, or blurred vision occur during treatment, timely monitoring is required. If it is confirmed that the increase in blood pressure is related to mitotane, it can generally be improved through hormone replacement therapy, dose reduction, or adjustment of dosing strategy. In some patients, blood pressure can return to baseline after hormone levels stabilize.

Reference materials:https://go.drugbank.com/drugs/DB00648