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Registry Hub
Peer-Reviewed Evidence
HomeDrug RegistryCompareALYACEN 1 35 vs GILDESS 1 20
Comparative Pharmacology

ALYACEN 1 35 vs GILDESS 1 20 Comparison

Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.

Clinical EssentialsPharmacokineticsSpecial PopulationsSafety & MonitoringPregnancy & LactationClinical Insights
Differential Analysis

ALYACEN 1/35 vs GILDESS 1/20

Head-to-head clinical comparison of therapeutic indices and safety profiles.

View ALYACEN 1/35 Monograph View GILDESS 1/20 Monograph
ALYACEN 1/35
Oral Contraceptive
Category C
GILDESS 1/20
Oral Contraceptive
Category C

Clinical Essentials

ALYACEN 1/35
GILDESS 1/20
Mechanism of Action
ALYACEN 1/35

Combination hormonal contraceptive: ethinyl estradiol suppresses gonadotropin release via negative feedback on hypothalamic-pituitary axis; norethindrone induces progestational effects including cervical mucus thickening and endometrial changes, inhibiting ovulation and sperm penetration.

GILDESS 1/20

GILDESS 1/20 is a combination oral contraceptive containing ethinyl estradiol (an estrogen) and gestodene (a progestin). Its primary mechanism is inhibition of ovulation via suppression of gonadotropin-releasing hormone (Gn RH), leading to reduced follicle-stimulating hormone (FSH) and luteinizing hormone (LH) secretion. Additionally, it alters cervical mucus (increasing viscosity to impede sperm penetration) and endometrial structure (rendering it unsuitable for implantation).

Indications
ALYACEN 1/35

Prevention of pregnancy

GILDESS 1/20

Prevention of pregnancy,Treatment of moderate acne vulgaris,Contraceptive for women with menstrual disorders

Standard Dosing
ALYACEN 1/35

One tablet (norethindrone 1 mg and ethinyl estradiol 35 mcg) orally once daily for 21 consecutive days, followed by 7 days of placebo or no tablets.

GILDESS 1/20

One tablet orally daily, each containing 20 mcg ethinyl estradiol and 150 mcg desogestrel.

Direct Interaction
ALYACEN 1/35
No Direct Interaction
GILDESS 1/20
No Direct Interaction

Pharmacokinetics

ALYACEN 1/35
GILDESS 1/20
Half-Life
ALYACEN 1/35

Norethindrone: 8-11 hours (terminal); ethinyl estradiol: 10-20 hours (terminal). The half-life supports once-daily dosing for oral contraceptive efficacy.

GILDESS 1/20

Ethinylestradiol: terminal half-life ~13-27 hours (mean 17 hours). Gestodene: terminal half-life ~12-15 hours. Steady-state reached within 5-7 days.

Metabolism
ALYACEN 1/35

Ethinyl estradiol: primarily hepatic via CYP3A4; norethindrone: hepatic reduction and sulfate conjugation.

Special Populations

ALYACEN 1/35
GILDESS 1/20
Renal Adjustments
ALYACEN 1/35

No dose adjustment required for mild to moderate renal impairment. Contraindicated in severe renal impairment or acute renal failure due to potential fluid retention and electrolyte disturbances.

GILDESS 1/20

No dosage adjustment required for mild-to-moderate renal impairment. Insufficient data for severe renal impairment; use with caution.

Hepatic Adjustments
ALYACEN 1/35

Safety & Monitoring

ALYACEN 1/35
GILDESS 1/20
Black Box Warnings
ALYACEN 1/35
FDA Black Box Warning

Cigarette smoking increases risk of serious cardiovascular events from combined oral contraceptives. Risk increases with age and heavy smoking (≥15 cigarettes/day). Women over 35 who smoke should not use this product.

Pregnancy & Lactation

ALYACEN 1/35
GILDESS 1/20
Teratogenic Risk
ALYACEN 1/35

Pregnancy category X. Use of ALYACEN 1/35 (norethindrone/ethinyl estradiol) is contraindicated during pregnancy. First trimester: Increased risk of congenital anomalies, including cardiovascular defects and limb reduction defects. Second/third trimesters: Potential for urogenital abnormalities and feminization of male fetus. Exposure is associated with subsequent development of clear cell adenocarcinoma of vagina/cervix in female offspring (DES-related).

GILDESS 1/20

GILDESS 1/20 (ethinyl estradiol 20 mcg/desogestrel 0.15 mg) is category X in pregnancy. First trimester: increased risk of congenital anomalies (e.g., heart defects, limb reduction) from estrogen component; cardiovascular and nervous system malformations reported. Second and third trimesters: associated with masculinization of female fetus from progestin; increased risk of IUGR and preterm birth. Use contraindicated in pregnancy.

Clinical Insights

ALYACEN 1/35
GILDESS 1/20
Clinical Pearls
ALYACEN 1/35

ALYACEN 1/35 is a combination oral contraceptive containing ethinyl estradiol 35 mcg and norgestimate 1 mg. It is indicated for the prevention of pregnancy and for the treatment of moderate acne vulgaris in females ≥15 years of age who desire an oral contraceptive. Monitor for thromboembolic events, especially in smokers over 35 or those with migraine with aura. Use with caution in patients with liver impairment or history of cholestatic jaundice. The pill-free interval should not exceed 7 days; missed pills increase ovulation risk. Consider non-hormonal backup if vomiting or diarrhea occurs within 4 hours of dosing.

GILDESS 1/20

GILDESS 1/20 is a monophasic oral contraceptive containing 20 mcg ethinyl estradiol and 1 mg norethindrone acetate. It is indicated for contraception and may be used for acne vulgaris in women at least 15 years old. Monitor for breakthrough bleeding, especially in the first cycles. Counsel patients to take at the same time daily to maintain efficacy. Caution in women with migraine with aura, hypertension, or history of thromboembolism. Prescribe as a 21-day regimen with a 7-day hormone-free interval.

Safety Verification

Known Interactions

ALYACEN 1/35 Risks

No interactions on record

GILDESS 1/20 Risks

No interactions on record

Clinical Q&A

Frequently Asked Questions

1. What is the primary difference between ALYACEN 1/35 and GILDESS 1/20?

ALYACEN 1/35 and GILDESS 1/20 are distinct pharmacological agents. ALYACEN 1/35 belongs to the Oral Contraceptive class and is primarily used for Prevention of pregnancy. GILDESS 1/20 belongs to the Oral Contraceptive class and is primarily used for Prevention of pregnancyTreatment of moderate acne vulgarisContraceptive for women with menstrual disorders. Their specific mechanisms of action, pharmacokinetic characteristics, and side effects differ.

2. Are ALYACEN 1/35 and GILDESS 1/20 safe during pregnancy?

The maternal-fetal safety profiles of these drugs differ. ALYACEN 1/35 carries a safety status of Category C, whereas GILDESS 1/20 safety is classified as Category C. Consult a board-certified physician or healthcare specialist to establish an accurate, individualized pregnancy risk assessment before starting either therapy.

GILDESS 1/20

Both ethinyl estradiol and gestodene are metabolized primarily in the liver via the cytochrome P450 3A4 (CYP3A4) pathway. Ethinyl estradiol undergoes first-pass metabolism and enterohepatic recirculation; gestodene is hydroxylated and conjugated.

Excretion
ALYACEN 1/35

Renal excretion of metabolites (primarily ethinyl estradiol and norethindrone conjugates) accounts for approximately 50-60% of elimination; fecal excretion accounts for 30-40%. Unchanged drug excretion is minimal (<5%).

GILDESS 1/20

Renal (estradiol: ~40-50% as glucuronide and sulfate conjugates; gestodene: ~30-40% as metabolites) and fecal (estradiol: ~20-30%; gestodene: ~30-40%). Less than 1% excreted unchanged.

Protein Binding
ALYACEN 1/35

Norethindrone: 61% bound to albumin and SHBG; ethinyl estradiol: 97-98% bound to albumin.

GILDESS 1/20

Ethinylestradiol: 98% bound to albumin. Gestodene: 75-90% bound to sex hormone-binding globulin (SHBG) and albumin.

VD (L/kg)
ALYACEN 1/35

Norethindrone: 3.8-4.5 L/kg; ethinyl estradiol: 2.0-4.0 L/kg. Large Vd indicates extensive tissue distribution.

GILDESS 1/20

Ethinylestradiol: ~2.4 L/kg. Gestodene: ~0.7 L/kg. Indicates extensive tissue distribution.

Bioavailability
ALYACEN 1/35

Oral: Norethindrone ~64%, ethinyl estradiol ~38-48% (due to first-pass metabolism).

GILDESS 1/20

Oral: Ethinylestradiol ~40-60% (first-pass metabolism). Gestodene ~99% (highly bioavailable due to minimal first-pass effect).

Contraindicated in patients with hepatic impairment, including Child-Pugh class B or C, due to impaired metabolism of estrogen and progestin. Not recommended in patients with active liver disease or history of liver tumors.

GILDESS 1/20

Contraindicated in hepatic adenomas, active liver disease, or Child-Pugh class B/C cirrhosis. For mild hepatic impairment (Child-Pugh A), no dosage adjustment; monitor.

Pediatric Dosing
ALYACEN 1/35

Not indicated for use before menarche. For postmenarchal adolescents, same dosing as adults. Safety and efficacy established for contraception; weight-based dosing not applicable.

GILDESS 1/20

Not indicated for use in pediatric patients before menarche. Post-menarche, same as adult dosing; use only after establishment of regular menstrual cycles.

Geriatric Dosing
ALYACEN 1/35

Not indicated for use after menopause due to lack of benefit and increased risks (e.g., cardiovascular, thromboembolic events). If used, monitor for fluid retention, hypertension, and glucose intolerance.

GILDESS 1/20

Not indicated for use in postmenopausal women. No specific geriatric dosing; generally not used in elderly women due to increased risk of thromboembolism.

GILDESS 1/20
FDA Black Box Warning

Cigarette smoking increases the risk of serious cardiovascular events from combination oral contraceptive use. This risk increases with age and with heavy smoking (≥15 cigarettes per day) and is particularly pronounced in women over 35 years of age. Women who use combination oral contraceptives should be strongly advised not to smoke.

Warnings/Precautions
ALYACEN 1/35
  • Thrombotic disorders (e.g., DVT, PE, stroke, MI)
  • Cerebrovascular disease
  • Hepatic neoplasia
  • Gallbladder disease
  • Hypertension
  • Carbohydrate and lipid effects
  • Ocular lesions
  • Hereditary angioedema
  • Chloasma
  • Menstrual irregularities
  • Pregnancy exclusion prior to initiation
GILDESS 1/20
  • Risk of thromboembolic disorders (venous and arterial), including myocardial infarction and stroke
  • Increased risk of hypertension and associated vascular complications
  • Potential hepatic neoplasia (benign and malignant)
  • Possible exacerbation of cholestatic jaundice or gallbladder disease
  • May cause fluid retention, which can aggravate conditions such as migraine, asthma, cardiac, or renal dysfunction
  • Altered carbohydrate metabolism: monitor glucose in diabetic patients
  • May worsen depression or epilepsy
Contraindications
ALYACEN 1/35
  • Venous or arterial thrombotic/thromboembolic disease (current or history)
  • Cerebrovascular disease
  • Coronary artery disease
  • Known or suspected breast cancer
  • Endometrial or other estrogen-dependent neoplasia
  • Undiagnosed abnormal genital bleeding
  • Cholestatic jaundice of pregnancy or jaundice with prior pill use
  • Hepatic adenoma or carcinoma
  • Known or suspected pregnancy
  • Hypersensitivity to any component
  • Smoking in women over 35
GILDESS 1/20
  • Known or suspected pregnancy
  • Current or history of thrombosis (deep vein thrombosis, pulmonary embolism, myocardial infarction, stroke)
  • History of cerebrovascular accident
  • Current or history of breast cancer or other estrogen-sensitive neoplasia
  • Undiagnosed abnormal uterine bleeding
  • Active liver disease or impaired liver function
  • Hypersensitivity to any component of the product
  • Uncontrolled hypertension
  • Diabetes with vascular involvement
  • Headaches with focal neurological symptoms (e.g., migraine with aura) at age ≥35
  • Major surgery with prolonged immobilization
Adverse Reactions
ALYACEN 1/35
Data Pending
GILDESS 1/20
Data Pending
Food Interactions
ALYACEN 1/35

No significant food interactions. Grapefruit juice may increase estrogen levels, but clinically not a concern. Avoid excessive alcohol, which may impair liver function and increase estrogen exposure. Maintain a healthy diet, as weight gain is possible.

GILDESS 1/20

No specific food interactions are reported for GILDESS 1/20. However, grapefruit juice may increase estrogen levels; advise patients to consume grapefruit products in moderation. Alcohol may impair judgment regarding missed doses; recommend moderate intake.

Lactation Summary
ALYACEN 1/35

Small amounts of contraceptive steroids and/or metabolites have been identified in breast milk. M/P ratio: Not specifically determined for this combination; ethinyl estradiol M/P ratio ~0.02-0.04. Use may reduce milk production and quality. Breastfeeding not recommended during use. Alternative contraception advised.

GILDESS 1/20

Excreted in breast milk; ethinyl estradiol M/P ratio ~0.4, desogestrel M/P ratio ~0.6. May reduce milk quantity and quality; small amounts pose theoretical risk of estrogenic effects in infant. Generally not recommended during breastfeeding; alternative contraception advised.

Pregnancy Dosing
ALYACEN 1/35

Contraindicated in pregnancy; no dose adjustments applicable. Discontinue medication immediately upon pregnancy detection.

GILDESS 1/20

No dose adjustments applicable as drug is contraindicated in pregnancy. Pharmacokinetic changes in pregnancy (increased hepatic metabolism, increased renal clearance) would reduce efficacy, but use is not recommended.

Maternal Safety Status
ALYACEN 1/35
Category C
GILDESS 1/20
Category C
Patient Counseling
ALYACEN 1/35

Take one tablet daily at the same time each day; do not skip doses.,Use an additional non-hormonal contraceptive (e.g., condoms) if you miss a pill, have vomiting, or diarrhea.,Smoking while on this pill increases the risk of blood clots and stroke, especially if you are over 35.,Contact your healthcare provider immediately if you have chest pain, leg pain/swelling, sudden vision changes, or severe headache.,This medication does not protect against HIV or other sexually transmitted infections.,Store at room temperature, away from moisture and heat.

GILDESS 1/20

Take one pill at the same time every day, even if you do not have sex often.,If you miss a pill, follow the instructions in the package insert or consult your healthcare provider.,Use a backup method (like condoms) if you miss more than one pill or start late.,Common side effects include nausea, breast tenderness, and spotting, especially in the first few cycles.,Contact your doctor if you experience severe abdominal pain, chest pain, headache, vision changes, or leg pain/swelling.,Smoking increases the risk of serious cardiovascular side effects; avoid smoking while on this medication.,Do not take GILDESS if you are pregnant or suspect pregnancy.