Hctz interactions
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Hydrochlorothiazide (HCTZ) Interactions: A Comprehensive Overview
Introduction to Hydrochlorothiazide (HCTZ)
Hydrochlorothiazide (HCTZ) is a widely used diuretic medication primarily prescribed for the treatment of hypertension and edema. It functions by inhibiting the NaCl-cotransporter in the kidneys, leading to increased excretion of sodium and water. However, HCTZ can interact with various substances, affecting its pharmacokinetics and pharmacodynamics.
HCTZ and Garlic Interaction
Pharmacokinetic and Pharmacodynamic Effects
A study on rats investigated the interaction between HCTZ and garlic homogenate (GH). The results indicated that GH significantly increased the bioavailability and half-life of HCTZ while decreasing its clearance and elimination rate. Additionally, GH enhanced the diuretic effect of HCTZ but reduced kaliuresis, particularly at a dose of 250 mg/kg. This interaction also showed protective effects on myocardial stress, suggesting that moderate doses of garlic could enhance the therapeutic effects of HCTZ with minimal adverse effects .
HCTZ and Human Serum Albumin (HSA)
Binding and Structural Changes
Research has shown that HCTZ binds to human serum albumin (HSA), inducing compactness in the protein's molecular structure. This binding occurs primarily through hydrogen bonding and van der Waals interactions, significantly quenching the intrinsic fluorescence of HSA. The binding of HCTZ to HSA affects both the secondary and tertiary structures of the protein, as evidenced by various spectroscopic techniques .
HCTZ and Tolvaptan
Pharmacokinetic and Pharmacodynamic Interactions
A study involving healthy men examined the interactions between HCTZ and tolvaptan, a non-peptide AVP antagonist. The findings revealed no clinically significant changes in the pharmacokinetic profiles of either drug when coadministered. However, tolvaptan increased free water clearance and urine volume while decreasing urine osmolality. These effects were consistent whether tolvaptan was administered alone or with HCTZ, indicating that the combination is safe and well-tolerated .
HCTZ and Intestinal NaCl-Cotransporter
Role in Calcium Homeostasis
HCTZ's interaction with the NaCl-cotransporter (NCC) extends beyond the kidneys to the intestines. Studies have demonstrated the presence of NCC in the rat small intestine and human intestinal cells. HCTZ modulates calcium uptake by intestinal cells, suggesting a functional interaction between NCC and epithelial voltage-dependent calcium channels. This interaction plays a role in calcium homeostasis and blood pressure regulation .
HCTZ with Amlodipine and Valsartan
Pharmacokinetic Profiles in Hypertensive Patients
A multicenter study evaluated the pharmacokinetic interactions between HCTZ, amlodipine, and valsartan in hypertensive patients. The results showed no clinically relevant pharmacokinetic interactions among the drugs when used in combination. Valsartan exposure increased slightly when coadministered with HCTZ and amlodipine, but this was not considered clinically significant. All treatments were safe and well-tolerated .
HCTZ with Benazepril and Valsartan
Bioavailability and Safety in Chinese Volunteers
In healthy Chinese volunteers, the pharmacokinetic profiles of HCTZ were compared when used alone and in combination with benazepril or valsartan. Benazepril decreased the bioavailability of HCTZ, while valsartan significantly increased its plasma concentration. Despite these changes, the combinations were well-tolerated, indicating safe coadministration .
HCTZ and Fixed-Dose Combinations
Supersaturating Drug Delivery Systems
Research on fixed-dose combinations of HCTZ with other antihypertensive drugs like candesartan cilexetil (CC) has shown that ternary amorphous solid dispersions (ASD) can generate and maintain supersaturation of both drugs. This approach enhances the dissolution rate and stability of the drugs, making it a promising system for fixed-dose combinations .
HCTZ and Irbesartan
Synergistic Effects in Hypertensive Dogs
A study on renal hypertensive dogs revealed that the combination of irbesartan and HCTZ had a synergistic effect on lowering blood pressure. Irbesartan increased the peak plasma concentration and area under the curve of HCTZ at steady-state, enhancing its antihypertensive effects. This combination showed greater efficacy than irbesartan alone .
Conclusion
Hydrochlorothiazide (HCTZ) interacts with various substances, affecting its pharmacokinetics and pharmacodynamics. These interactions can enhance its therapeutic effects or alter its bioavailability. Understanding these interactions is crucial for optimizing HCTZ therapy and ensuring patient safety.
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Most relevant research papers on this topic
The potential for interaction of hydrochlorothiazide with garlic in rats.
Garlic in moderate doses may improve hypertension treatment by reducing potassium excretion, potentially reducing the dose of hydrochlorothiazide with minimal adverse effects.
Hydrochlorothiazide binding to human serum albumin induces some compactness in the molecular structure of the protein: A multi‐spectroscopic and computational study
Hydrochlorothiazide binding to human serum albumin decreases surface hydrophobicity and affects both secondary and tertiary structures of the protein.
Pharmacokinetic and Pharmacodynamic Interaction Between Tolvaptan, a Non-Peptide AVP Antagonist, and Furosemide or Hydrochlorothiazide
Tolvaptan, a non-peptide AVP antagonist, is safe and well-tolerated when administered alone or in combination with furosemide or hydrochlorothiazide.
Fosinopril and Hydrochlorothiazide Combination versus Individual Components: Lack of a Pharmacokinetic Interaction
A combination tablet of fosinopril and hydrochlorothiazide shows pharmacokinetic profiles similar to those achieved when either drug is administered alone or when coadministered in separate tablets, with no significant interaction observed.
DOI
Supersaturating drug delivery systems containing fixed-dose combination of two antihypertensive drugs: formulation, in vitro evaluation and molecular metadynamics simulations.
Ternary ASDs of candesartan cilexetil and hydrochlorothiazide using HPMCAS M show promising potential for fixed-dose combinations, maintaining supersaturation and exhibiting great storage stability.
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