Related Experiment Video
Updated: Jun 19, 2026
06:51
Ovariectomy and 17β-estradiol Replacement in Rats and Mice: A Visual Demonstration
Published on: June 7, 2012
Type and route of estrogen administration
1National Heart & Lung Institute, Imperial College London, Royal Brompton Hospital, London, UK.
Climacteric : the Journal of the International Menopause Society
|October 9, 2009
Summary
Hormone replacement therapy (HRT) offers similar benefits for menopausal symptom relief and bone health, regardless of oral or non-oral administration. Route choice impacts metabolic effects, with personal preference often guiding the decision for most women.
Area of Science:
- Endocrinology
- Pharmacology
- Women's Health
Background:
- Hormone replacement therapy (HRT) is a common treatment for menopausal symptoms and osteoporosis prevention.
- HRT can be administered via oral or non-oral (e.g., transdermal) routes.
- Different routes of administration have distinct metabolic and potential cardiovascular effects.
Purpose of the Study:
- To compare the metabolic and cardiovascular effects of oral versus non-oral hormone replacement therapy.
- To evaluate the impact of the hepatic first-pass effect associated with oral HRT.
- To provide guidance on selecting the optimal HRT route based on individual patient characteristics.
Main Methods:
- Comparative analysis of existing studies on oral and non-oral HRT.
- Review of metabolic effects, including lipid profiles, insulin resistance, and triglycerides.
- Assessment of cardiovascular markers, such as vascular endothelial function and inflammation.
Main Results:
- Both oral and non-oral HRT effectively manage menopausal symptoms and prevent bone loss.
- Oral HRT induces a hepatic first-pass effect, leading to greater reductions in LDL cholesterol and insulin resistance, but also increased triglycerides and coagulation activation.
- Cardiovascular effects appear similar between routes, with dose being a potentially more significant factor than administration route.
Conclusions:
- The choice between oral and non-oral HRT depends on individual metabolic profiles and risk factors.
- Oral HRT may benefit women with insulin resistance, while transdermal HRT might be preferred for those with coagulation issues.
- For most women, personal preference should guide the selection of HRT route after considering potential benefits and risks.
Related Concept Videos
01:22Routes of Drug Administration: Overview
Drug administration involves delivering drugs to the body through various routes, such as enteral, parenteral, and topical.
Enteral administration refers to drugs absorbed through the gastrointestinal tract. They can be swallowed (perorally), placed under the tongue (sublingually), or on the inner lining of the cheeks (buccally). Perorally administered drugs take time to be absorbed and have a slower onset of action. The rectal route is another form of enteral administration, which allows for...
Enteral administration refers to drugs absorbed through the gastrointestinal tract. They can be swallowed (perorally), placed under the tongue (sublingually), or on the inner lining of the cheeks (buccally). Perorally administered drugs take time to be absorbed and have a slower onset of action. The rectal route is another form of enteral administration, which allows for...
01:18Drug Delivery: Enteral Route
The enteral drug administration involves three primary routes: oral, sublingual, and buccal. Oral ingestion is the most prevalent, safe, economical, and convenient method for drug administration. However, it has certain drawbacks, including limited absorption due to the drug's low water solubility or poor membrane permeability, possible emesis from GI mucosa irritation, destruction of drugs by digestive enzymes or low gastric pH, and irregular absorption along with food or other drugs.
Drugs in...
Drugs in...
01:18Routes of Drug Administration: Enteral
Medications can be administered through the enteral route using liquids, capsules, or tablets.
Enteral administration involves drug administration via the mouth in two ways: orally or sublingually.
Unlike sublingually drugs, drugs that are taken orally pass through the gastrointestinal (GI) tract and get metabolized by the liver. Once metabolized, the drug is absorbed into the systemic circulation, reaching different body parts via the bloodstream. However, while passing through the stomach,...
Enteral administration involves drug administration via the mouth in two ways: orally or sublingually.
Unlike sublingually drugs, drugs that are taken orally pass through the gastrointestinal (GI) tract and get metabolized by the liver. Once metabolized, the drug is absorbed into the systemic circulation, reaching different body parts via the bloodstream. However, while passing through the stomach,...
01:19Dosage Interval and Administration Route: Determination Methods
A medication’s effectiveness largely depends on its appropriate dosage and the route of administration. Dosage ensures that a sufficient drug concentration is maintained in the bloodstream to elicit the desired therapeutic effect without causing toxicity. The route of administration affects the drug's bioavailability, rate of absorption, and onset of action, which are crucial for achieving optimal therapeutic outcomes. Drug dosage calculations are critical to tailoring therapy to individual...
01:21Intrauterine Drug Delivery Systems
Controlled-release systems for intravaginal and intrauterine drug delivery have been developed primarily for the administration of contraceptive steroid hormones. These delivery routes circumvent first-pass hepatic metabolism, thereby enhancing bioavailability and allowing for reduced systemic dosages compared to oral administration. Such approaches contribute to improved therapeutic efficacy and patient compliance, particularly in long-term contraceptive regimens.Intravaginal Drug Delivery...
01:25Routes of Drug Administration: Parenteral
The administration of drugs via parenteral routes allows for direct drug introduction into the systemic circulation, resulting in high bioavailability because the medication bypasses the harsh conditions of the gastrointestinal tract and hepatic metabolism.
The intravenous route (IV) of drug administration can be further categorized into two types. The bolus injection administers the entire dose rapidly, while an intravenous infusion slowly delivers smaller doses steadily.
The IV route is often...
The intravenous route (IV) of drug administration can be further categorized into two types. The bolus injection administers the entire dose rapidly, while an intravenous infusion slowly delivers smaller doses steadily.
The IV route is often...