Zinnia

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Zinnia

Property Description
Active ingredient Cyproterone Acetate and Ethinyl Estradiol
Form Oral Tablet
Pharmacological class Antiandrogenic Contraceptive, Hormonal Combination
Common use Correction of androgen-driven hormonal imbalances
Origin Synthetic Compounds

What is Zinnia and What Class Does it Belong To?

Zinnia is a prescription-only combination hormonal preparation that is classified as an antiandrogenic contraceptive. This medication is defined by its two specific synthetic hormones, which offer both hormonal regulation and targeted action against male hormones, known as androgens. The formulation, known generically as co-cyprindiol, is widely recognized in clinical practice. This combination is used for the management of severe androgen-dependent conditions.


Composition and Drug Form: Cyproterone Acetate and Ethinyl Estradiol

The active ingredients in Zinnia are Cyproterone Acetate and Ethinyl Estradiol, which are formulated as an oral tablet. Ethinyl Estradiol is a widely utilized synthetic estrogen component that aids in cycle stabilization. Crucially, the combination is characterized by Cyproterone Acetate (CPA), a compound that functions as a potent antiandrogen while simultaneously exerting strong progestogenic effects. This dual functionality is clinically recognized for its efficacy in mitigating the systemic effects of androgens. Both active compounds are entirely synthetic in origin, and the oral route ensures systemic delivery of these agents.


General Purpose of This Combination Hormonal Preparation

The general therapeutic purpose of Zinnia is to establish a controlled hormonal state to correct imbalances driven by excessive androgen activity. By uniting a powerful antiandrogen with an estrogen, the preparation is designed to reduce the influence of androgens at a fundamental level. This systemic approach is useful when the physical manifestations of hormonal dysregulation, such as certain skin or hair issues, are directly linked to high levels or increased sensitivity to androgens. The medication works systematically to address the root hormonal cause, offering a comprehensive hormonal solution.

Regulatory References

  1. EMA Referral on Cyproterone Acetate/Ethinylestradiol

What side effects are possible with Zinnia?

Possible Side Effects and Safety Information

The safety profile for Zinnia (flibanserin) is primarily structured around risks related to hypotension (low blood pressure) and syncope (fainting), as established by government regulatory bodies. The most significant safety measure is a Black Box Warning in the U.S. and equivalent high-level warnings elsewhere, detailing conditions that increase these risks.


Critical Safety Restrictions

Zinnia is contraindicated (must not be used) under specific conditions due to the risk of severe hypotension and syncope:

  • Alcohol Use: Concurrent use with any amount of alcohol is strictly forbidden.
  • Liver Impairment: The medicine must not be used by patients with any degree of hepatic impairment (liver dysfunction).
  • Drug Interactions: Concurrent use with strong or moderate CYP3A4 inhibitors (certain common medications) is prohibited, as these significantly increase the drug's concentration in the body.

Common Adverse Reactions

The most frequently reported side effects are primarily linked to the central nervous system (CNS):

System Organ Class Common Reactions (Very Common / Common)
Nervous System Somnolence (sleepiness), Dizziness, Insomnia, Vertigo
Vascular Hypotension, Syncope
Gastrointestinal Nausea, Dry mouth, Constipation, Abdominal pain
General Disorders Fatigue

Time- and Population-Specific Notes

The risks of dizziness, somnolence, and syncope are increased if the medication is taken during waking hours; it is therefore prescribed for administration at bedtime. Treatment should be discontinued if the intended therapeutic effect is not observed after 8 weeks.

Overdose and Emergency Response

Overdose and When to Seek Help

The information regarding overdose for Zinnia (Cyproterone Acetate and Ethinyl Estradiol) is derived exclusively from governmental regulatory prescribing information. Acute overdosage with this combination hormonal preparation is generally not anticipated to result in serious, life-threatening consequences.


Documented Manifestations of Overdose

The expected clinical manifestations following acute ingestion of a large dose are primarily non-serious and are documented in regulatory sources:

System Documented Manifestation
Gastrointestinal Nausea and vomiting
Reproductive Withdrawal bleeding (expected in females)

Required Emergency Action

Official regulatory guidance mandates specific actions in the event of overdosage, emphasizing the need for professional monitoring and supportive care:

  • No specific antidote is known for this hormonal combination.
  • Treatment for overdose is officially described as symptomatic and supportive.
  • Immediate action is required: patients must consult a doctor or pharmacist in the event of an overdosage, or contact the nearest hospital or poison centre if a healthcare professional is unavailable. This instruction mandates seeking urgent medical evaluation and observation.

Therapeutic Uses of Zinnia

The combination hormonal preparation Zinnia (Cyproterone Acetate and Ethinyl Estradiol) is applied in situations involving certain distressing symptoms, primarily for women experiencing symptoms related to systemic imbalance or heightened tissue sensitivity to male hormones.

The preparation is commonly used to help with conditions characterized by periods of heightened symptoms. The preparation is commonly used to help with the physical symptoms caused by hyperandrogenism, specifically moderate to severe acne related to androgen sensitivity (with or without seborrhoea) and/or hirsutism (unwanted, male-pattern hair growth). It is often used during phases when symptoms become more noticeable, particularly when initial treatment approaches have not provided sufficient symptomatic support.

“The preparation assists with maintaining functional stability and supports patients during episodes of heightened discomfort related to these visible symptoms that interfere with daily functioning.”

This systemic use helps address symptom clusters related to persistent skin breakouts and excessive hair growth, which contributes to easing the overall symptom load and supports general well-being during symptomatic periods.


Quick Fact: Relief for Hyperandrogenic Symptoms Zinnia is relevant in clinical settings for managing the skin and hair manifestations that arise in contexts like Polycystic Ovary Syndrome (PCOS), where it also assists with maintaining functional stability and supports general well-being during symptomatic phases related to menstrual pattern disturbances.

Regulatory References

  1. European Medicines Agency (EMA) guidance on cyproterone- and ethinylestradiol-containing medicines

Eligibility and Restrictions for Use

Zinnia (lercanidipine) is an oral medication that can only be used by adults aged 18 years and older who do not have any officially documented contraindications. Use in children and adolescents under 18 is not recommended due to insufficient data on efficacy and safety.

Contraindications (Must Not Use)

Zinnia is contraindicated and must not be used in individuals with:

  • Hypersensitivity to lercanidipine, any dihydropyridine, or any excipients.
  • Specific severe cardiac conditions, including untreated congestive cardiac failure, unstable angina pectoris, recent myocardial infarction (within one month), or left ventricular outflow tract obstruction.
  • Severe impairment of certain organs, specifically severe hepatic impairment or severe renal impairment (Glomerular Filtration Rate < 30 mL/min), including patients on dialysis.
  • Pregnancy and lactation, or for women of child-bearing potential not using effective contraception.
  • Concomitant use with strong inhibitors of the CYP3A4 enzyme (e.g., ketoconazole, ritonavir), the immunosuppressant ciclosporin, or consumption of grapefruit/grapefruit juice.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory documents for Zinnia (Cyproterone Acetate and Ethinyl Estradiol) define several mandatory restrictions and documented interaction patterns based on pharmacokinetic and pharmacodynamic profiles.

Contraindicated Combinations and Prohibitions

The co-administration of Zinnia is strictly prohibited with other hormonal preparations, including all forms of hormonal contraception. Co-use is also contraindicated with specific Hepatitis C combination drug regimens (e.g., ombitasvir/paritaprevir/ritonavir pm dasabuvir), due to the documented risk of elevated liver enzymes (ALT).

Pharmacokinetic and Exposure Effects

Substances classified as hepatic enzyme inducers are documented to reduce the plasma concentration (exposure) of Zinnia's active components, which diminishes effectiveness. This class includes medicines such as Rifamycins and certain Anticonvulsants. The herbal product St. John's Wort is also listed as an enzyme inducer. Conversely, the Ethinyl Estradiol component can increase the exposure of co-administered agents like Corticosteroids and Tizanidine by inhibiting their clearance.

Administration and Condition Constraints

A pharmacodynamic interaction exists with Anticoagulants due to Zinnia's documented effect on blood clotting factors. Regulatory labeling requires that if gastro-intestinal upset (vomiting or severe diarrhoea) occurs shortly after ingestion, additional non-hormonal precautions must be utilized for seven consecutive days. Furthermore, the presence of severe hepatic disease is an interaction-related condition that requires discontinuation if liver function does not normalize.

Mechanism of Action

The mechanism of Zinnia (Cyproterone Acetate and Ethinyl Estradiol) involves a dual action that modulates the hormonal environment both centrally and peripherally. This approach targets androgen regulation at three stages: production, systemic bioavailability, and cellular action.

Central Endocrine System Control

The combination engages the Hypothalamic-Pituitary-Ovarian (HPO) axis by utilizing the progestogenic and estrogenic activity of the two compounds to induce strong negative feedback. This central action leads to the suppression of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) release. The resulting physiological effect is a substantial reduction in the body's natural production and secretion of ovarian androgens.

Peripheral Cellular Blockade and Synergy

Cyproterone Acetate acts directly on peripheral target cells by functioning as a competitive antagonist at the Androgen Receptor (AR) and exerting an inhibitory effect on the 5alpha-reductase enzyme. Concurrently, Ethinyl Estradiol stimulates the liver to increase Sex Hormone-Binding Globulin (SHBG) synthesis. The resulting rise in SHBG binds circulating testosterone, reducing the plasma concentration of free, biologically active androgen, which enhances the mechanistic influence of the central suppression and peripheral receptor blockade. The ultimate physiological consequence is the modulation of the functional state of the pilosebaceous unit.

Dosage and Administration Information

Administration Guidelines

This section outlines the usage instructions for the combined oral tablet containing Cyproterone Acetate 2 mg and Ethinyl Estradiol 0.035 mg.

Instruction Detail
Route of administration Oral
Dosing schedule One active tablet taken daily for 21 consecutive days, followed by a 7 tablet-free day interval.
Timing in relation to meals (if applicable) Taken at the same time every day. May be taken with or without food.
Age-group administration rules Intended for women of reproductive age.
Missed-dose rules If a single active tablet is delayed by less than 12 hours, it should be taken immediately. If the delay is longer than 12 hours, additional non-hormonal contraception must be used for the next 7 days.
Special procedural conditions The medicine should not be used concurrently with any other hormonal contraceptive.

Instruction Classifications (High-Level)

Classification Detail
Administration method type Oral
Frequency pattern Daily use within a cyclic regimen
Use-context constraints Time-limited use, a cyclic schedule, and monotherapy.

Resulting Procedural Structure

Step sequence:

  • Begin tablet intake on the first day of the menstrual cycle.
  • Take one tablet daily for 21 days, strictly following the sequence on the pack.
  • Follow the 21-day course with a 7 tablet-free day interval before starting the next pack.

Connection to the overall use protocol:

The administration follows a sequential oral intake based on a 21/7 cyclic pattern, which establishes a standardized monthly schedule. This regimen is designed for time-limited use; the medicine is typically discontinued 3 to 4 cycles after the symptoms have completely resolved. The protocol defines both the fixed daily sequence of intake and the overall duration of the treatment course.

Recent Clinical Evidence

Zinnia (levonorgestrel/ethinyl estradiol) is a combination oral contraceptive containing two types of female sex hormones, a progestogen and an estrogen. Clinical evidence confirms its primary mechanism of action: preventing pregnancy primarily by inhibiting ovulation, thickening cervical mucus to impede sperm entry, and altering the lining of the uterus to reduce the chance of implantation.

Efficacy and Safety Profile

The efficacy of Zinnia, when taken as prescribed, is high. However, no contraceptive method is 100% effective. Recent clinical data and regulatory reviews have continued to emphasize the established safety concerns associated with all combined oral contraceptives.

The most serious, albeit rare, adverse effect involves an increased risk of blood clots (thrombotic events). This elevated risk applies to both venous thromboembolism (VTE), such as deep vein thrombosis (DVT) and pulmonary embolism (PE), and arterial blood clots, which can lead to stroke or heart attack. The risk is considered highest during the first year of use and is lower than the risk of developing clots during pregnancy. Factors such as increasing age, smoking, and being significantly overweight (BMI over 30 kg/m^2) further increase the risk.

Common side effects are typically mild and often resolve over time. These include nausea, vomiting, headache, changes in appetite or weight, breast tenderness, and breakthrough bleeding or spotting, particularly during the initial months of use. In some individuals, the medication may also worsen pre-existing conditions like depression or high blood pressure, and it is contraindicated in individuals with a history of certain cancers, specific liver conditions, or uncontrolled hypertension.


Key Considerations from Clinical Trials

Clinical Consideration Finding
Primary Indication Highly effective for pregnancy prevention.
Blood Clot Risk Increased risk of VTE/arterial clots; lower than clot risk during pregnancy.
Contraindications History of blood clots, uncontrolled high blood pressure, certain liver diseases.
Metabolic Effects Potential to affect lipid (fat) and glucose metabolism.

Frequently Asked Questions (FAQ)

Common questions about Zinnia (FAQ)


Q: Is Zinnia the same as another drug I've heard of?

A: Official product information describes Zinnia as a brand name for a combination preparation containing Cyproterone Acetate and Ethinyl Estradiol. This specific combination of active ingredients may be marketed and sold under various other brand names, depending on the country or region.


Q: What should I do if I miss a dose of Zinnia?

A: Regulatory guidelines specify different actions depending on the delay. If a single active tablet is delayed by less than 12 hours, official guidance suggests taking it immediately. However, if the delay is longer than 12 hours, official instructions note that contraceptive protection may be reduced, and the use of additional non-hormonal precautions is typically described for the next seven days.


Q: How long can a person typically stay on Zinnia?

A: Official guidance recommends that treatment with Zinnia be discontinued 3 to 4 cycles after the treated symptoms (such as acne or hirsutism) have completely resolved. Official guidance indicates that the need for continued treatment is typically evaluated regularly.


Q: How quickly does Zinnia usually start to work?

A: Studies and official information indicate that the time required to achieve symptomatic relief for androgen-related conditions is documented as at least three months. Conditions like severe acne and seborrhoea may start to respond within this timeframe, while conditions like excessive hair growth (hirsutism) are often noted to take longer.


Q: Is Zinnia known to cause weight gain or loss?

A: According to official product information, both weight gain and weight loss are listed as possible adverse reactions associated with the use of Zinnia. These effects are documented in official adverse event reports.


Q: Are headaches a common side effect of Zinnia?

A: Yes, regulatory documents list headache as a common adverse reaction that may be experienced by users of Zinnia. The worsening of headaches, including migraines, is described in official documentation as a symptom that may warrant discontinuation.


Q: Does Zinnia affect sleep patterns?

A: The official list of possible adverse effects includes conditions such as insomnia (difficulty sleeping) and somnolence (sleepiness). These specific reactions have been reported in official clinical and post-marketing data.


Q: Is it safe to use Zinnia if I have kidney issues?

A: Specific conditions related to kidney impairment are addressed in official labeling. The presence of severe renal impairment (severe kidney problems) is a condition for which official documents require careful consideration and medical supervision.


Q: Are there any long-term effects of using Zinnia?

A: A primary long-term safety consideration noted in official warnings is the increased risk of blood clots (thrombotic events). This elevated risk applies to both veins and arteries, with the risk typically highest during the first year of use.


Q: Is Zinnia used for things other than its main purpose?

A: Zinnia is officially indicated for the treatment of moderate to severe acne and/or hirsutism in women of reproductive age. Although the combination acts as a hormonal contraceptive, regulatory guidelines strictly state that it should not be combined with any other hormonal contraceptive.


Q: Does Zinnia interact with birth control pills?

A: Yes, co-administration of Zinnia with other hormonal preparations, including all forms of hormonal contraception, is strictly prohibited or contraindicated according to official regulatory documents.


Q: What is the risk of dependence or addiction with Zinnia?

A: Zinnia's active ingredients are not classified as controlled substances. Official drug information and dependency schedules typically do not list this medication as having the potential for abuse or dependence.


Q: Is Zinnia safe for use in older adults?

A: Zinnia is prescribed for androgen-related conditions in women of reproductive age. Regulatory labeling indicates that the general risk of cardiovascular events, including blood clots, increases with age, particularly for women over 35 who smoke.


Q: Are there specific official warnings about Zinnia that users should know?

A: Yes, official documents contain prominent warnings detailing the increased risk of serious blood clots (venous and arterial thrombotic events). These warnings emphasize that the risk is documented to be influenced by various factors, including smoking and pre-existing medical conditions.


Q: What is the significance of the research evidence for Zinnia?

A: Regulatory documents describe the evidence supporting the efficacy of the drug for its approved uses, such as treating moderate to severe acne and hirsutism. This evidence is based on clinical trials that demonstrate the antiandrogenic and cycle-regulating effects of the combination.


Q: Is Zinnia known to cause mood changes or irritability?

A: Yes, official product information lists mood changes and irritability as documented adverse reactions. If psychological effects become a concern, consulting a healthcare professional is consistent with official guidance.


Q: Can Zinnia affect the results of lab tests?

A: Official product information states that Zinnia can influence the results of certain laboratory tests. These may include those used to assess the function of the liver, thyroid, and adrenal glands, as well as blood clotting factors.


Q: Is fatigue a documented side effect of Zinnia?

A: Yes, fatigue is listed as a possible adverse reaction in the official product information for Zinnia. This is a common systemic effect documented in clinical studies.


Q: What is the general eligibility criteria for Zinnia?

A: The drug is indicated for women of reproductive age with moderate to severe acne or hirsutism. It is contraindicated (must not be used) in individuals with specific pre-existing conditions, such as a history of blood clots, certain liver conditions, or uncontrolled high blood pressure.


Q: Does Zinnia have a special designation from the FDA?

A: The combination of Cyproterone Acetate and Ethinyl Estradiol is subject to standard regulatory requirements for combination hormonal products. In its approved uses, it is classified as a prescription-only drug.


Q: Is it normal to feel no change when first starting Zinnia?

A: Yes, regulatory documentation indicates that the time needed to see a clinical response can take at least three months. Therefore, feeling no immediate change when first beginning treatment is consistent with the documented timeline for the drug's efficacy.


Q: Is Zinnia approved for use in children or adolescents?

A: The drug is officially indicated for use in women of reproductive age (meaning after the onset of menstruation). Use in children before this developmental stage is not recommended or supported by regulatory data.


Q: Are allergic reactions to Zinnia common?

A: Hypersensitivity (an allergic reaction) to any component of the medication is a defined contraindication in official documents. If signs of an allergic reaction occur, official guidance states that immediate medical attention is necessary.


Q: What is the official description of Zinnia's use conditions?

A: The official use conditions are for the treatment of moderate to severe acne related to androgen-sensitivity (with or without seborrhoea) and/or hirsutism (excessive hair growth) in women of reproductive age who also require contraception.


Q: Is there a maximum length of time Zinnia can be used?

A: Yes, official guidance recommends that the treatment should be withdrawn 3 to 4 cycles after the patient's symptoms have completely resolved. The drug is intended to be used for a limited duration of time for the purpose of treating androgen-related symptoms.


Q: Does Zinnia have any known effects on driving or operating machinery?

A: Official regulatory text advises caution because adverse effects such as dizziness and headache are possible. Patients are generally advised to determine how they react to the medication before attempting to drive or operate machinery.


Q: Can I use Zinnia if I have a history of heart problems?

A: No. Zinnia is contraindicated and must not be used in individuals with a history of certain severe cardiovascular conditions. This includes a history of arterial thrombotic events, stroke, angina, or previous myocardial infarction.


Q: What are the most commonly reported side effects of Zinnia?

A: Commonly reported side effects listed in official documents include nausea, headache, breast tenderness, changes in body weight, and mood changes. These effects are generally mild and may resolve after the initial months of use.


Q: Why is Zinnia prescribed for its listed uses?

A: Zinnia is prescribed because it contains a potent antiandrogen (Cyproterone Acetate) combined with an estrogen (Ethinyl Estradiol). This combination works systemically to reduce the influence of excessive male hormones (androgens), which are the documented root cause of the patient's symptoms.


Q: Is there a concern about Zinnia raising blood pressure?

A: Yes, a significant rise in blood pressure is one of the signs listed in official warnings that may require the immediate discontinuation of the medication. Regular monitoring of blood pressure is described in official documents as a standard precaution during use.

How should Zinnia be stored and disposed of?

How to Store and Dispose of Zinnia (Cyproterone Acetate and Ethinyl Estradiol)

Official regulatory guidelines define specific conditions for the storage and disposal of Zinnia tablets.


Required Storage Conditions

Scope Element Requirement from Official Labeling
Temperature Control Store at a temperature below 30°C (86°F).
Protection Mandates Protect the tablets from light and store them in a dry environment.
Packaging Rule The medicine must be kept in its original blister pack.
Child Safety Keep Zinnia out of the sight and reach of children.

Disposal Instructions

Any unused or expired Zinnia tablets and associated waste material must be disposed of in accordance with local requirements. There are no special handling requirements; however, standard environmental protocols generally advise against disposal in household wastewater.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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