Drospirenone

Introduction

Drospirenone is a synthetic progestin used in combination with estrogen in hormonal contraceptives. It is also used to treat moderate acne and premenstrual dysphoric disorder (PMDD). Drospirenone is known for its anti-androgenic and anti-mineralocorticoid properties, which can help in managing hormonal imbalance and associated symptoms.

Uses

Drospirenone is commonly used in combination with estrogen in oral contraceptives to prevent pregnancy. It is also prescribed for the treatment of moderate acne in females over 14 years of age who also wish to use hormonal contraception. Additionally, it is used to manage symptoms of premenstrual dysphoric disorder (PMDD) in women who are also taking hormonal contraceptives.

Brand Name	Drospirenone
Type
Weight
Generic	Drospirenone
Manufacturer
Available in	English বাংলা

Mechanism of Action

Drospirenone works by mimicking the effects of the natural hormone progesterone. It inhibits ovulation by suppressing the release of gonadotropins from the pituitary gland, which prevents the ovaries from releasing an egg. It also alters the endometrial lining, making it less suitable for implantation, and thickens cervical mucus to impede sperm passage.

How Long Does It Take to Work?

When used as a contraceptive, Drospirenone , in combination with estrogen, generally provides effective pregnancy prevention after 7 days of consistent use. It may take several weeks to observe improvements in acne or PMDD symptoms.

Absorption

Drospirenone is well absorbed from the gastrointestinal tract after oral administration. Its peak plasma concentrations are typically reached within 1 to 2 hours. It has high oral bioavailability, and food does not significantly affect its absorption.

Route of Elimination

Drospirenone is primarily metabolized in the liver. It is excreted in the urine as metabolites, with a small amount excreted in the feces. The drug undergoes extensive hepatic metabolism, which involves conjugation and further breakdown in the liver.

Dosage

Drospirenone (white active and light pink inert tablets) is swallowed whole once a day. Take one tablet daily for 28 consecutive days; one white active tablet daily during the first 24 days and one light pink inert tablet daily during the 4 following days. Tablets must be taken every day at about the same time of the day so that the interval between two tablets is always 24 hours.

Instructions for starting of Drospirenone: Starting in females with no current use of hormonal contraception (Day 1 Start) Important: Consider the possibility of ovulation and conception prior to initiation of this product. Tablet Color: Drospirenone active tablets are white (Day 1 to Day 24). Drospirenone inert tablets are light pink (Day 25 to Day 28).

Day 1 Start :

Take the first white active tablet on the first day of menses.
Take subsequent white active tablets once daily at the same time each day for a total of 24 days.
Take one light pink inert tablet daily for 4 days and at time of day that active tablets were taken.
Begin each subsequent pack on the same day of the week as the first cycle pack (i.e., on the day after taking the last inactive tablet).

Instructions for switching of Drospirenone:

Switching from another contraceptive method to Drospirenone: Start Drospirenone.
A Combined Oral Contraceptive (COC): On the day when the new pack of the previous COC would have started.
Transdermal Patch: On the day when next application would have been scheduled.
Vaginal ring: On the day when next insertion would have been scheduled.
Injection: On the day when next injection would have been scheduled.
Intrauterine contraceptive: On the day of removal.
Implant: On the day of removal.

Refer to the Patient Information and Instructions for Use for additional instructions for counseling patient concerning proper use.

The standard dosage for Drospirenone , when used in combination with estrogen in oral contraceptives, is one tablet daily for 21 consecutive days, followed by a 7-day break or a period of inactive tablets. For the treatment of moderate acne or PMDD, the dosing regimen is similar, and the medication is generally taken continuously for 21 days, with a 7-day break or inactive tablets.

Administration

Drospirenone is administered orally in the form of tablets. For optimal effectiveness, it should be taken at the same time each day. Consistency is important to maintain effective hormone levels and prevent breakthrough bleeding or pregnancy.

Side Effects

Common side effects of Drospirenone include nausea, headache, breast tenderness, mood changes, and weight gain. Some users may also experience spotting or breakthrough bleeding, especially during the first few months of use.

Toxicity

Toxicity is rare with Drospirenone when used as directed. However, overdose can lead to severe side effects such as jaundice, severe abdominal pain, and thromboembolic events. In such cases, medical attention should be sought immediately.

Precautions

Precautions should be taken in patients with a history of thromboembolic disorders, liver disease, or breast cancer. Regular monitoring is recommended for women with these conditions. Drospirenone should be used with caution in smokers over the age of 35 due to an increased risk of cardiovascular events.

Interaction

Drospirenone may interact with other medications, including enzyme inducers such as rifampin and certain antiepileptics, which can reduce its effectiveness. It may also interact with medications affecting liver enzymes, potentially altering its metabolism.

Disease Interaction

In patients with renal impairment, liver disease, or a history of cardiovascular disorders, Drospirenone should be used with caution. Adjustments to dosing or alternative treatments may be necessary based on individual health conditions.

Drug Interaction

Drospirenone may interact with other medications such as antibiotics, antiepileptics, and certain HIV medications, which can impact its effectiveness. It is important to consult with a healthcare provider when taking other drugs to avoid potential interactions.

Food Interactions

Food does not significantly affect the absorption of Drospirenone . However, it is generally recommended to take the medication with food if it causes gastrointestinal discomfort.

Pregnancy Use

Drospirenone is contraindicated during pregnancy. It is classified as Category X, indicating that it has been shown to cause harm to the fetus. Women should discontinue use if pregnancy occurs or is suspected.

Lactation Use

Drospirenone may be excreted in breast milk, but its effects on a nursing infant are not well-studied. It is advised to use alternative contraceptive methods while breastfeeding, or consult a healthcare provider for guidance on safety.

Acute Overdose

Acute overdose of Drospirenone can lead to symptoms such as severe nausea, vomiting, and abdominal discomfort. There is no specific antidote, and treatment generally involves symptomatic management and supportive care.

Contraindication

Drospirenone is contraindicated in individuals with known hypersensitivity to the drug or any component of the formulation, as well as in those with a history of thromboembolic disorders, liver tumors, or uncontrolled hypertension.

Use Direction

Drospirenone should be taken exactly as prescribed. It is important to follow the dosing schedule, take the medication consistently at the same time each day, and adhere to the recommended cycle of 21 active days followed by 7 days of inactive tablets or a break.

Storage Conditions

Drospirenone should be stored at room temperature, away from moisture and direct sunlight. Keep the medication in its original packaging to protect it from light and humidity. Do not use after the expiration date.

Volume of Distribution

The volume of distribution of Drospirenone is approximately 3.5 to 4 liters/kg, indicating a moderate distribution throughout body tissues.

Half Life

The elimination half-life of Drospirenone is approximately 1 to 2 days. This allows for daily dosing and consistent therapeutic levels with regular use.

Clearance

Drospirenone is primarily cleared through hepatic metabolism and renal excretion. The drug's clearance is influenced by liver function, and dose adjustments may be necessary in patients with hepatic impairment.

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