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[Doxazosin (Carduran)--a research survey]
H P Stokke1, P Fauchald, I Holme
1Medisinsk avdeling B, Rikshospitalet, Oslo.
Insights
This study on doxazosin for hypertension found 53% of patients reported side effects, mainly in the first month. While effective for blood pressure, caution is advised for patients with heart conditions.
Area of Science:
- Pharmacology
- Cardiovascular Medicine
- Public Health
Background:
- Essential hypertension is a widespread condition requiring effective treatment.
- Doxazosin is a medication introduced for hypertension management.
- Surveillance studies are crucial for understanding real-world drug safety and efficacy.
Purpose of the Study:
- To systematically collect data on side effects and events associated with doxazosin treatment.
- To evaluate the effects of doxazosin on blood pressure, heart rate, and lipid profiles.
- To assess the safety and tolerability of doxazosin in a large patient cohort.
Main Methods:
- An open surveillance study involving 4,260 patients in Norway.
- Data collection over a one-year period.
- Recording of side effects, adverse events, blood pressure, heart rate, and lipid levels.
Main Results:
- 53% of patients reported side effects/events, with highest frequency in the first month.
- No new types of side effects were identified.
- Doxazosin demonstrated a favorable antihypertensive effect, with expected decreases in cholesterol and triglycerides, but an unexpected decline in HDL-cholesterol.
Conclusions:
- Doxazosin is effective in treating essential hypertension.
- Safety precautions are recommended for patients with coronary heart disease and heart failure.
- Careful management is needed when initiating or changing treatment, especially in patients with pre-existing cardiac conditions.
Abstract:
4,260 patients were included in an open surveillance study simultaneously with the introduction of doxazosin for treatment of essential hypertension in Norway. The main aim of the study was to systematically collect information on side effects and events in patients being treated with a new drug. The effect on blood pressure, heart rate and lipids was also recorded. The study lasted for one year. 21 deaths were reported. 53% of the patients reported side effects and/or events. The frequency of side effects was particularly high during the first month of treatment. No new types of side effects were found. The initial higher frequency of reported side effects referred to all organ systems, and was also of the same magnitude in the different systems. A relation was found between certain cardiac side effects and/or events and cessation of previous medication upon starting treatment with doxazosin. The study shows that certain safety precautions should be observed in patients with coronary heart disease and heart failure. In three patients, doxazosin should be used only in combination with more specific treatment. Special caution should be observed when changing the specific basic treatment. Doxazosin had a very favourable antihypertensive effect. A drop in cholesterol and triglycerides was observed, as expected. The HDL-cholesterol value declined, which was unexpected. The results are difficult to interpret, owing to lack of a control group. On the other hand, the study shows how high blood pressure is being treated with drugs in ordinary practice. The authors discuss the methodology of surveillance studies.