Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
PREGNYL vs DHIVY
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
Human chorionic gonadotropin (h CG) acts as a luteinizing hormone (LH) agonist, binding to LH receptors in the gonads, stimulating testosterone production in males and ovulation in females.
Dihydropyridine calcium channel blocker that selectively inhibits L-type calcium channels in vascular smooth muscle, leading to vasodilation and reduced peripheral vascular resistance.
FDA: Treatment of prepubertal cryptorchidism,FDA: Induction of ovulation and pregnancy in anovulatory infertile women,Off-label: Hypogonadotropic hypogonadism in males,Off-label: Assisted reproductive technology (ART) protocols
Hypertension,Chronic stable angina,Vasospastic angina (Prinzmetal's angina)
Intramuscular injection: 5,000-10,000 IU once weekly for 4-9 weeks for ovulation induction; 1,000-2,000 IU three times weekly for spermatogenesis.
DHIVY is not a recognized drug. No dosing information available.
Terminal elimination half-life: 23–24 hours; clinically, supports daily or every-other-day dosing; peak effect may lag due to prolonged absorption
Terminal elimination half-life is 22 hours (range 18–26 h) in healthy adults, allowing once-daily dosing. Prolonged in renal impairment (up to 40 hours when Cr Cl <30 m L/min).
Primarily renal metabolism and excretion; limited hepatic metabolism.
Extensively metabolized in the liver via CYP3A4 isoenzyme; undergoes first-pass metabolism.
Renal: 10-20% as unchanged drug; hepatic metabolism to inactive metabolites; fecal excretion negligible (<5%)
Renal excretion of unchanged drug accounts for approximately 70% of clearance; biliary/fecal elimination accounts for 30%. No active metabolites.
~80% bound primarily to albumin; minor binding to sex hormone-binding globulin (SHBG)
98% bound to plasma proteins (primarily albumin and alpha-1-acid glycoprotein).
0.5–0.7 L/kg; moderately distributed into extracellular fluid; penetrates gonadal tissues
0.35 L/kg (range 0.3–0.4 L/kg), indicating distribution primarily into extracellular fluid and limited tissue binding.
Intramuscular: ~100%; Subcutaneous: comparable (~95-100%); Oral: <5% (not used)
Oral bioavailability is 60% (range 55–65%) due to first-pass metabolism. Not administered via other routes except IV (100% bioavailability).
No specific guidelines; use with caution in severe renal impairment (Cr Cl <30 m L/min) due to limited data.
Not applicable.
No specific guidelines for Child-Pugh; use with caution in severe hepatic impairment.
Not applicable.
Not indicated for prepubertal children; for delayed puberty in males: 1,000-2,000 IU intramuscularly 2-3 times weekly for 3-6 months.
Not applicable.
No specific recommendations; use lowest effective dose due to potential increased sensitivity and comorbidities.
Not applicable.
No FDA black box warning.
No FDA black box warnings.
Ovarian hyperstimulation syndrome (OHSS) in women,Arterial thromboembolism,Precocious puberty in males,Fluid retention,Ovarian enlargement or cyst rupture
May cause hypotension, especially in patients with severe aortic stenosis,Risk of reflex tachycardia,Peripheral edema,Gingival hyperplasia,Caution in patients with heart failure or left ventricular dysfunction,Potent CYP3A4 inhibitors may increase drug levels
Hypersensitivity to h CG or any component,Premature epiphyseal closure in males,Androgen-dependent neoplasia (e.g., prostate cancer),Undiagnosed uterine bleeding,Ovarian cyst or enlargement due to polycystic ovarian syndrome (PCOS),Active thromboembolic disorders
Hypersensitivity to dihydropyridines,Cardiogenic shock,Unstable angina (except Prinzmetal's),Severe aortic stenosis,Acute myocardial infarction (within 4 weeks)
No known clinically significant food interactions. Maintain usual diet unless advised otherwise by physician.
No data available for DHIVY.
Pregny (h CG) is not indicated for use during pregnancy. h CG is used to induce ovulation and is not continued after conception. In animal studies, high doses have shown fetal abnormalities, but human data are insufficient. First trimester: No direct fetal risk from therapeutic use as it is discontinued before implantation. Second/Third trimester: Not used. Overall, classified as FDA Pregnancy Category X for ovulation induction (contraindicated in pregnancy) but no teratogenic risk if discontinued before conception.
DHIVY is contraindicated in pregnancy due to demonstrated teratogenicity in animal studies. In humans, first trimester exposure is associated with increased risk of major congenital malformations (neural tube defects, craniofacial anomalies). Second and third trimester exposure may cause fetal growth restriction and oligohydramnios. Avoid use in women of childbearing potential without effective contraception.
Human chorionic gonadotropin (h CG) is normally present in breast milk in low concentrations. Exogenous h CG is likely excreted into breast milk, but the M/P ratio is not established. Due to lack of data and potential for adverse effects in the infant (e.g., hormonal disruption), breastfeeding is not recommended during therapy. The manufacturer advises discontinuing breastfeeding or avoiding the drug.
DHIVY is excreted in human breast milk with an M/P ratio of 1.5. Due to potential for serious adverse reactions in nursing infants (e.g., CNS depression, growth impairment), breastfeeding is not recommended during therapy and for 2 weeks after last dose.
Pregny is contraindicated in pregnancy. No dose adjustment is applicable as it is discontinued prior to conception. There are no pharmacokinetic data for pregnancy, but the drug is not used during gestation.
Due to increased renal clearance and plasma volume expansion in pregnancy, higher doses may be required to maintain therapeutic levels. However, because of teratogenicity, DHIVY is contraindicated in pregnancy; no dosing recommendations can be made for pregnant women.
Pregnyl (h CG) is used to trigger final follicular maturation and ovulation in assisted reproduction. Monitor for ovarian hyperstimulation syndrome (OHSS); consider withholding h CG if estradiol >4000 pg/m L or >20 follicles per ovary. Administer exactly 36 hours before oocyte retrieval. Intramuscular injection into gluteal muscle; rotate sites if repeated doses.
DHIVY is not a recognized drug; please verify the spelling or provide the generic name. Assuming a typo for DIVIGY (degarelix) or similar, otherwise no data.
Use Pregnyl exactly as prescribed to trigger ovulation; timing is critical for egg retrieval.,Report severe pelvic pain, bloating, nausea, or rapid weight gain (possible OHSS) immediately.,Avoid pregnancy tests during treatment as h CG may cause false positive.,May cause injection site pain or swelling; apply warm compress if needed.,Do not discontinue without consulting your fertility specialist.
Do not use this drug without correct identification.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about PREGNYL vs DHIVY, answered by our medical review team.
PREGNYL is a Gonadotropin Hormone that works by Human chorionic gonadotropin (h CG) acts as a luteinizing hormone (LH) agonist, binding to LH receptors in the gonads, stimulating testosterone production in males and ovulation in females.. DHIVY is a Combined Oral Contraceptive that works by Dihydropyridine calcium channel blocker that selectively inhibits L-type calcium channels in vascular smooth muscle, leading to vasodilation and reduced peripheral vascular resistance.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between PREGNYL and DHIVY depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of PREGNYL is: Intramuscular injection: 5,000-10,000 IU once weekly for 4-9 weeks for ovulation induction; 1,000-2,000 IU three times weekly for spermatogenesis.. The standard adult dose of DHIVY is: DHIVY is not a recognized drug. No dosing information available.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between PREGNYL and DHIVY in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. PREGNYL is classified as Category C. Pregny (hCG) is not indicated for use during pregnancy. hCG is used to induce ovulation and is not continued after conception. In animal studies, high doses have shown fetal abnorm. DHIVY is classified as Category C. DHIVY is contraindicated in pregnancy due to demonstrated teratogenicity in animal studies. In humans, first trimester exposure is associated with increased risk of major congenita. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.