Hidroferol Wöchentlich

Hidroferol Wöchentlich is an oral over‑the‑counter product that contains calcifediol monohydrate as its active ingredient. The preparation is supplied in a weekly dosing format, marketed in the European Union, and is intended to provide a source of 25‑hydroxyvitamin D. It is classified as a vitamin D metabolite and is available without a prescription.

Calcifediol monohydrate is a naturally occurring metabolite of vitamin D3 and is used primarily to support normal calcium and phosphate balance in the body.

- Supports maintenance of adequate serum 25‑hydroxyvitamin D concentrations - May be considered in individuals with limited sunlight exposure - Can be used as part of a nutritional regimen for bone health - May assist in correcting mild vitamin D insufficiency identified by laboratory testing - Provides a convenient weekly oral administration schedule - Can be combined with calcium supplementation under professional guidance

Adverse reactions to calcifediol are generally mild, but rare serious events have been reported.

Common: - Mild gastrointestinal discomfort (nausea, abdominal bloating) - Transient headache - Elevated serum calcium without symptoms - Skin rash or mild itching

Serious: - Hypercalcemia with symptoms such as confusion, muscle weakness, or arrhythmia - Severe allergic reaction (anaphylaxis, swelling of face or throat) - Kidney stone formation

When using calcifediol, certain health conditions and situations require careful consideration to minimize risk.

- Do not use if known hypersensitivity to calcifediol or any excipients. - Avoid use in uncontrolled hyperparathyroidism or active granulomatous disease. - Exercise caution in patients with renal impairment or a history of kidney stones. - Monitor serum calcium and 25‑hydroxyvitamin D levels during prolonged therapy. - Pregnant or breastfeeding individuals should consult a healthcare professional before use. - Elderly patients may be more susceptible to hypercalcemia and should be monitored. - Concurrent use with high‑dose vitamin D supplements may increase risk of excess calcium.

Calcifediol can affect the activity of several medications, and some drugs may alter its metabolism or serum levels.

Avoid: - Concomitant use with thiazide diuretics in patients prone to hypercalcemia. - High‑dose calcium supplements without medical supervision. - Concurrent use with vitamin D analogues (e.g., calcitriol) unless directed by a clinician.

Use with caution: - Combined with glucocorticoids, as they may reduce vitamin D effectiveness. - Combined with anticonvulsants such as phenytoin or phenobarbital, which can increase vitamin D catabolism. - Combined with bisphosphonates, monitoring calcium status. - Combined in patients receiving lithium, which can affect calcium metabolism.