Potassium deficiency can set the stage for rhabdomyolysis, a severe form of muscle breakdown, because chronically low potassium impairs normal muscle metabolism, contraction, and blood-flow regulation during exertion. In potassium‑depleted muscle, exercise normally meant to trigger local potassium‑mediated vasodilation instead occurs on a background of blunted blood‑flow increase and relative ischemia, which can tip active fibers toward cramps, fiber necrosis, and release of muscle enzymes such as creatine kinase and myoglobin. Case reports describe patients with profound hypokalemia from causes like primary aldosteronism, short‑bowel–related losses, or periodic paralysis presenting with weakness, dark “cola‑colored” urine, and very high creatine kinase levels, often improving after aggressive potassium repletion and hydration, highlighting that low potassium can be a hidden, correctable driver of non‑traumatic rhabdomyolysis. This medication is commonly used for Hypertension.
Jain VV, Gupta OP, Jajoo SU, Khiangate B. Hypokalemia induced rhabdomyolysis. Indian J Nephrol. 2011 Jan;21(1):66. Chung-Tso Chen, et al. Hypokalemia-Induced Rhabdomyolysis Caused by Adrenal Tumor-Related Primary Aldosteronism: A Report of 2 Cases. Am J Case Rep 2021; 22:e929758. He R, Guo WJ, She F, Miao GB, Liu F, Xue YJ, Liu YW, Wang HT, Zhang P. A rare case of hypokalemia-induced rhabdomyolysis. J Geriatr Cardiol. 2018 Apr;15(4):321-324. Dimitrios J. Antoniadis, et al. Rhabdomyolysis Due to Diuretic Treatment. Hellenic J Cardiol 44: 80-82, 2003.
Some side effects may be linked to nutrient depletion caused by this medication.
Studies suggest that Felodipine, a type of calcium channel blocker (CCB), may increase the excretion of calcium in the urine. While the long-term effects on bone health are unclear, some healthcare professionals suggest calcium supplementation for patients taking felodipine, especially those at higher risk of osteoporosis.
Research suggests that Felodipine, a type of calcium channel blocker (CCB), may increase the excretion of magnesium in the urine. This can potentially lead to magnesium deficiency. Studies have shown an increase in fractional excretion of magnesium following felodipine treatment, and the drug may also alter how magnesium moves across red blood cell membranes. Therefore supplementation with magnesium should be considered when on this therapy.
An increased excretion of potassium can occur in people taking calcium channel blocker drugs like felodipine. Supplementation may need to be considered if blood levels of potassium are low.