P.L.H.

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P.L.H.

Medically reviewed

Marina Burgos

Last updated on 22/12/2025

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 P.L.H.

What Type of Medicine is P.L.H.?

P.L.H. is a prescription-only gonadotropin medicine that provides a highly specific replacement for the body's natural luteinizing hormone (LH). The active ingredient is Lutropin alfa, a specialized recombinant protein classified as a Gonadotropin. This classification indicates that the medicine works by regulating hormone systems critical to reproductive health. The general purpose of P.L.H. is to restore a crucial hormonal component in adult women who have a deficiency in this substance. As a heterodimeric glycoprotein, the medicine is designed to possess the full biological activity of endogenous human LH, supporting essential endocrine processes in those with conditions like hypogonadotropic hypogonadism and profound LH deficiency (<1.2 IU/L). It serves as a necessary LH component within these therapeutic contexts.


Lutropin Alfa: Recombinant Origin and Composition

Lutropin alfa is a genetically engineered substance produced via recombinant DNA technology to ensure high structural consistency and purity. This recombinant process represents a key characteristic of the medicine, ensuring that the molecular structure closely mirrors the naturally occurring hormone. The medicine is presented as a sterile lyophilized powder and solvent for solution for injection, which is specifically designed for reconstitution with an aqueous solvent immediately before use. This pharmaceutical preparation is intended solely for subcutaneous injection.


How P.L.H. Supports the Endocrine System

Lutropin alfa functions as a highly targeted receptor agonist, directly mimicking the signaling of the body's luteinizing hormone within the endocrine system. Its physiological action involves binding specifically to the Luteinizing Hormone/Choriogonadotropin (LH/CG) receptor, which is the missing signal in patients with LH deficiency. This enables actions like the stimulation of theca cells to secrete necessary androgens. Importantly, it works in synergy to support Follicle-Stimulating Hormone (FSH)-induced follicular development, fulfilling the general purpose of restoring the necessary hormonal balance in the reproductive pathway for adult women. This type of hormone replacement is used to support the initial stages of the menstrual cycle in patients with severe LH deficiency.

What side effects are possible with P.L.H.?

Possible side effects and safety information

The safety profile for P.L.H. (Lutropin alfa) is based on classifications used by official regulatory authorities, detailing potential adverse reactions according to the physiological system affected and the reported frequency of occurrence.

Frequency-Classified Adverse Reactions

Adverse reactions are formally categorized based on incidence rates observed during clinical studies:

  • Common (1/100 to < 1/10): Headache, various gastrointestinal symptoms (including abdominal pain, nausea, vomiting, and diarrhea), administration site reactions (such as pain, bruising, or irritation), and Ovarian Hyperstimulation Syndrome (OHSS) in its mild to moderate form.
  • Uncommon (1/1,000 to < 1/100): Hot flush, pelvic discomfort, breast tenderness, and general abdominal discomfort.
  • Rare (1/10,000 to < 1/1,000): The formation of blood clots, known as Thromboembolism.
  • Very Rare (< 1/10,000): Severe hypersensitivity reactions, including anaphylaxis.

Serious Adverse Reactions and Safety Constraints

The most clinically significant adverse events documented are Severe Ovarian Hyperstimulation Syndrome (OHSS) and Thromboembolism. Regulatory documents note that the risk of OHSS is highest during the hormone stimulation cycle and the two weeks immediately following treatment.

Safety restrictions prohibit the use of P.L.H. in patients with specific conditions, including tumours of the pituitary gland or hypothalamus, unexplained gynaecological bleeding, and primary ovarian failure. Furthermore, patients with pre-existing risk factors for Thromboembolism have an increased potential for such events.

Overdose and Emergency Response

The official regulatory profile for P.L.H. defines the risk of overdose primarily through the development of Ovarian Hyperstimulation Syndrome (OHSS), the documented consequence of an excessive pharmacological response to gonadotropin therapy.

Overdose Scope and Manifestations

The principal documented manifestation of an excessive response is OHSS, which is classified by regulatory authorities into Mild, Moderate, or Severe stages. Symptoms listed in regulatory sources include abdominal pain, abdominal distension, nausea, vomiting, and rapid weight gain. Severe OHSS may affect the vascular system (thromboembolic events), reproductive system (ovarian torsion), and can cause difficulty breathing or oliguria (decreased urine output). The risk is documented as being higher in patients with Polycystic Ovarian Disease.

Emergency Actions and Help Seeking

If an excessive ovarian response is obtained, the treatment must be stopped, and the subsequent hCG injection must be withheld. Patients must seek immediate medical attention for signs of Severe OHSS, such as severe abdominal pain, rapid weight gain, or difficulty breathing. Management of Severe OHSS requires hospitalisation and specific therapy. No specific antidote is known for the effects of an overdose.

Connection to the Overall Overdose Profile

Regulatory documents define the overdose profile by focusing on the recognized complication of OHSS, which is the result of excessive stimulation rather than toxicological overdose. This regulatory approach mandates a high degree of vigilance, specifying that the appearance of severe symptoms requires immediate medical attention and the discontinuation of treatment. The official strategy emphasizes preventative action, symptom management, and hospital monitoring for severe manifestations.

Therapeutic Uses of P.L.H.

Quick Facts: Uses of P.L.H.

  • Aids in the management of specific types of infertility.
  • Supports the achievement of ovulation in certain patients.
  • Used in reproductive medicine protocols to assist follicular development.

P.L.H. (Lutropin alfa) is an approved medication utilized as an option for patients experiencing specific endocrine-related reproductive challenges. It is primarily administered in women with hypothalamic or pituitary insufficiency to address profound Luteinizing Hormone (LH) deficiency, which can interfere with normal fertility.

The use of P.L.H. is intended to assist in the process of follicular maturation and the development of ovarian follicles. When utilized as part of a therapeutic regimen, it may help to achieve or support the ovulation process necessary for conception.

Clinical guidelines and authorized indications provide details on the patient population for which this treatment is appropriate. Patients should consult their healthcare provider to determine if P.L.H. is suitable for their individual condition and therapeutic goals.

Eligibility and Restrictions for Use

Who Can and Cannot Use P.L.H. (Lutropin alfa)

Official regulatory documents strictly define the eligible patient population for P.L.H. and establish a range of absolute prohibitions. The medicine is indicated only for adult women who have a documented severe deficiency in Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH).


Contraindicated Populations

P.L.H. must not be used by individuals with specific pre-existing conditions or statuses, including:

  • Hypersensitivity to Lutropin alfa or any excipients.
  • Tumours of the hypothalamus or pituitary gland.
  • Carcinomas of the ovary, uterus, or mammary gland.
  • Primary ovarian failure.
  • Ovarian enlargement or cysts unrelated to Polycystic Ovarian Disease and of unknown origin.
  • Gynaecological haemorrhages of unknown origin.
  • Use is contraindicated during pregnancy and breastfeeding (lactation).

Population Limitations and Restrictions

Regulatory agencies state that the medicine is not recommended for the paediatric or elderly populations, as there is no relevant indication established for these age groups. Furthermore, the safety and efficacy of P.L.H. have not been established in patients with renal impairment or hepatic impairment. Individuals with conditions like porphyria or those with risk factors for thromboembolic events require careful evaluation before use.

What should I know about interactions with other medicines?

Official Regulatory Interaction Profile

The official regulatory documentation for P.L.H. (Lutropin alfa) indicates a highly specific interaction profile, primarily focused on its co-administration with other reproductive hormones. Lutropin alfa is a recombinant protein, and regulatory labels do not document interaction patterns related to the major CYP450 enzyme systems or common drug transporters.

Interaction Type Official Regulatory Statement
Pharmacodynamic Co-activity Co-administration with Follitropin alfa (recombinant FSH) is documented to result in increased ovarian sensitivity, which is a required effect of the therapeutic regimen.
Pharmacokinetic Profile No significant alteration of the pharmacokinetic properties (e.g., exposure or clearance) of either Lutropin alfa or Follitropin alfa is observed when the two are co-administered.
Metabolic/CYP Interactions None documented in official labels.

Administration and Mixing Restrictions

The most important documented constraint relates to the physical integrity of the medicine and co-administration requirements.

  • Physical Mixing Restriction: The reconstituted P.L.H. solution must not be combined with any other medicinal products in the same injection or vial. The only exception to this mandatory restriction is the permitted co-reconstitution with Follitropin alfa.
  • Contraindicated Combinations: No specific medicinal products are formally classified as contraindicated for co-administration based on a risk of drug-drug interaction within the official regulatory documents.

This interaction structure establishes procedural rules for administration and confirms a specific pharmacodynamic relationship, while lacking the typical metabolic interactions found with small molecule drugs.

Mechanism of Action

Blocking Core Biological Targets

The action of P.L.H. begins at the cellular level, where it functions as a selective antagonist by binding to specific membrane-bound receptors. This binding physically blocks the body's natural signaling molecules from activating the receptors, interrupting the signal transmission, which precedes the downstream pathway effects.


Modulating the Pro-Inflammatory Signaling Cascade

By blocking the initial receptor signal, P.L.H. effectively disrupts the entire downstream molecular cascade that would typically follow activation. This focused interference prevents the sustained production and release of inflammatory mediators, leading to the modulation of the systemic physiological response and a reduction in signaling activity within the affected pathways.


Shifting Towards Baseline Activity

The resulting reduced concentration of mediators is the key physiological consequence of P.L.H.'s mechanism. This action leads to a diminished level of mediator activity, resulting in a shift towards baseline activity within targeted biological systems.

Dosage and Administration Information

How to Use Palivizumab (P.L.H.) — Administration Guidelines

This section details the administration protocol for palivizumab.

Administration Requirements

Parameter Instruction
Route of Administration Intramuscular (IM) injection only.
Dosing Schedule 15 mg per kg of body weight. The exact volume is calculated based on the patient's current weight.
Frequency Once monthly (approximately every 28 to 30 days).
Course Duration Administered throughout the anticipated RSV season.

Preparation and Procedural Steps

Palivizumab is provided as a ready-to-use solution for injection. The administration process follows these steps:

  1. Preparation: The solution must NOT be shaken or vigorously agitated. It must NOT be diluted with any other liquids prior to injection. The solution should be inspected for discoloration or particles before use.
  2. Withdrawal: The calculated volume of the dose must be withdrawn using aseptic technique from the single-dose vial and administered immediately, as the product contains no preservatives.
  3. Injection Site: The preferred site for administration is the anterolateral aspect of the thigh. The gluteal muscle is generally avoided.
  4. Divided Doses: If the calculated volume to be administered exceeds 1 mL, the total dose must be divided and given as separate injections at different sites.
  5. Post-Procedure: If a patient undergoes cardiopulmonary bypass surgery, an additional dose of 15 mg/kg is required as soon as possible after the procedure, followed by the resumption of the standard monthly schedule.

Administration Protocol Summary

The protocol involves a precise, weight-based dose delivered exclusively via intramuscular injection on a fixed monthly cycle (28–30 days) throughout the designated season. The instructions for preparation and immediate use govern the correct handling of the product to ensure proper delivery.

Recent Clinical Evidence

Research Evidence Overview for P.L.H. (Lutropin alfa)

This section provides a factual overview of the clinical research conducted for Lutropin alfa, focusing on study design, endpoints, and the consistency of evidence, as reported in authoritative regulatory and scientific documents. This is a non-advisory summary of the study landscape.


Evidence for Use in Profound Luteinizing Hormone (LH) Deficiency

The primary research for P.L.H. focused on women with a profound hormonal deficiency, specifically adult women who have a condition called hypogonadotropic hypogonadism (HH), marked by severe deficiency of Luteinizing Hormone (LH). These studies were designed as randomized controlled trials (RCTs). Researchers monitored specific physiological outcomes designed to evaluate functional goals, including outcomes linked to the study of ovarian follicle measures and tracking post-ovulation hormone levels. Patterns related to the achievement of these specific functional goals were observed in patients receiving the LH component. The evidence for this composite endpoint in the defined HH population comes from multiple, consistent, well-controlled trials.

Research on LH Supplementation in Assisted Reproductive Technology (ART)

Research has explored the use of P.L.H. as a supplement to standard protocols for women undergoing Assisted Reproductive Technology (ART) procedures, such as IVF/ICSI. These studies monitored outcomes primarily focusing on the number of oocytes retrieved. The findings showed variability when evaluating the use of P.L.H. in unselected ART patient populations. For general groups of women undergoing ART, studies reported no notable difference in outcomes measured for the number of oocytes retrieved between treatment groups.

What Remains Unclear or Limited in the Research

A key limitation in the research is that the sample sizes were modest in the core indication, and the follow-up durations were limited primarily to the single treatment cycle itself. Furthermore, comparative evidence is lacking in some areas. The subgroup findings are uncertain because the criteria used to define groups like Poor Ovarian Responders varied across studies, leading to heterogeneity in the data.

Frequently Asked Questions (FAQ)

Common questions about P.L.H. (FAQ)


Q: How quickly should I expect to feel the effects of P.L.H.?

A: According to the official product information, after a single injection, P.L.H. reaches its highest concentration in the bloodstream within about 4 to 16 hours. Since P.L.H. supports specific reproductive processes, its full effectiveness is measured over the entire treatment period through clinical and laboratory assessments, not by immediate sensation.

Q: Is it possible to take P.L.H. long-term?

A: P.L.H. is indicated for specific treatment cycles related to reproductive health and is administered in combination with other hormones. The official regulatory documents indicate that its use is limited to the defined period needed to achieve specific treatment goals. The safety profile for long-term or continuous use beyond these treatment cycles is not established.

Q: How long does P.L.H. typically stay in your system after stopping?

A: Studies on P.L.H. (Lutropin alfa) show that the medicine is eliminated from the body with a mean terminal half-life of approximately 18 hours after subcutaneous administration. The mean terminal half-life is approximately 18 hours, which provides an estimate for how quickly the concentration of the medicine decreases in the body.

Q: Do people gain weight when taking P.L.H.?

A: Official regulatory information lists rapid weight gain as a symptom associated with Ovarian Hyperstimulation Syndrome (OHSS), which is a known and serious risk of treatment. However, general weight gain not linked to OHSS is not explicitly listed as a common or uncommon side effect of P.L.H. itself.

Q: What are the known interactions between P.L.H. and certain foods or supplements?

A: Regulatory labels do not document specific interactions between P.L.H. and common foods, supplements, or grapefruit juice. The established interaction profile is highly specific, primarily focusing on its necessary co-administration with other fertility hormones.

Q: What is the average duration of a course of P.L.H. treatment?

A: The duration of P.L.H. treatment is customized to the patient, as the medicine is typically used in conjunction with FSH until specific treatment goals are achieved. The process is closely monitored by a healthcare provider.

Q: Is P.L.H. considered a drug that needs to be tapered off?

A: P.L.H. is part of a timed cycle. It is discontinued once specific clinical goals are met, and the treatment proceeds according to the physician's prescribed protocol. It is not typically tapered off like some other medications.

Q: What happens if I accidentally miss a use of P.L.H.?

A: Official guidelines state that a patient should contact their healthcare provider right away for instructions. Official guidelines caution against doubling a dose to make up for a missed one, as the provider will need to determine the next step in the treatment schedule.

Q: Is P.L.H. safe for people with pre-existing kidney issues?

A: Official documents state that the safety, efficacy, and pharmacokinetics (how the medicine moves through the body) of P.L.H. have not been established in patients who have renal (kidney) impairment.

Q: What are the signs that P.L.H. is starting to work for me?

A: P.L.H.'s effectiveness is monitored through objective medical assessments performed by the healthcare provider. These signs include measuring ovarian follicle size using ultrasound and checking the response of estrogen (estradiol) levels in the blood.

Q: Is it normal to feel a bit nauseous when first starting P.L.H.?

A: Nausea is listed as a Common side effect of P.L.H., meaning it occurs in at least 1 out of 100 patients, as reported in clinical studies. While this is a commonly reported experience, any side effect can be reported to a healthcare provider.

Q: What did the main clinical trials for P.L.H. show about its benefits?

A: The main clinical trials for P.L.H. focused on women with profound LH deficiency. These studies demonstrated patterns related to achieving specific functional goals, including successful ovarian follicle measures and appropriate post-ovulation hormone levels, which are key steps in the reproductive process.

Q: Will P.L.H. affect my blood pressure or heart rate?

A: Changes in general blood pressure or heart rate are not listed as common adverse reactions in the official product information. However, Thromboembolism (blood clots), which can affect the cardiovascular system, is listed as a Rare adverse reaction.

Q: How should P.L.H. be stored?

A: The unopened powder and solvent vials must be stored in their original package, protected from light, and not stored above 25 C. The product must not be frozen. Once the solution is prepared for injection, it must be used immediately, and any unused portion must be discarded.

Q: What are the things to absolutely avoid when taking P.L.H.?

A: P.L.H.'s use is prohibited in individuals with specific conditions like certain tumors, primary ovarian failure, or unexplained bleeding. Additionally, the prepared solution must not be physically mixed with any other medicine in the same injection, except for Follitropin alfa (FSH).

Q: Does P.L.H. interfere with birth control pills?

A: The official regulatory interaction profile does not document a specific interaction with oral contraceptives. However, P.L.H. is used to promote follicular development, an action which is contrary to the goal of contraception. It is important for patients to consult a healthcare provider for guidance on birth control during treatment.

Q: Why do some people say P.L.H. caused them to feel dizzy?

A: Dizziness is not listed as a common side effect. However, it can be a symptom of a very serious adverse event like fainting (syncope) or a severe allergic reaction, which are listed in regulatory sources. Any experience of dizziness can be reported immediately to a healthcare provider.

Q: What is the earliest research evidence available for P.L.H. (Lutropin alfa)?

A: P.L.H. (Lutropin alfa) was approved in the US in 2004, and its regulatory documents cite extensive pre-clinical and clinical trial data. This body of research was essential in supporting the drug's application for its intended purpose.

Q: Is P.L.H. an addictive drug?

A: P.L.H. is classified as a gonadotropin and is a recombinant protein designed to mimic a naturally occurring hormone. It does not belong to any class of scheduled substances associated with the potential for abuse or dependence.

Q: Do I need to take P.L.H. with food, or can I take it on an empty stomach?

A: P.L.H. is administered by subcutaneous injection, and the regulatory guidelines for its use do not specify any required relationship to food intake. Therefore, it can be taken independently of meals.

Q: Is it normal to feel a bit more tired after starting P.L.H.?

A: Unusual tiredness or weakness is not listed as a common adverse reaction in official documents. However, it can be a symptom of flu-like symptoms, which is a less common side effect. Persistent or severe tiredness can be reported to a healthcare provider.

Q: Does P.L.H. interact with grapefruit juice?

A: The official regulatory labels do not document a specific interaction warning for P.L.H. (Lutropin alfa) and grapefruit juice.

Q: Are there any specific laboratory tests needed before starting P.L.H.?

A: Yes, regulatory documents note that a healthcare provider will conduct an evaluation before starting treatment. This includes checking for certain endocrine disorders and ensuring the absence of specific conditions like ovarian enlargement or cysts of unknown origin.

Q: How do doctors monitor the effectiveness of P.L.H. treatment?

A: Doctors monitor the effectiveness using objective medical tools, not patient reports of feeling better. This standard clinical monitoring includes tracking the size of the ovarian follicles using ultrasound and measuring the patient's estrogen (estradiol) response.

How should P.L.H. be stored and disposed of?

How to Store and Dispose of P.L.H. (Lutropin alfa)

Official regulatory guidelines define specific conditions for storing and disposing of this medicine.

Storage Conditions

The unopened powder and solvent vials must be stored in the original package to ensure protection from light. The medicine must not be stored above 25 C and must not be frozen. The product must be kept out of the sight and reach of children.

Once the medicine is reconstituted with the solvent, it is intended for immediate and single use. Any unused portion of the solution must be discarded as it is not stable for prolonged storage. The powder should be dissolved by gentle swirling and should not be shaken.

Disposal Instructions

Disposal of unused medicinal product, including any remaining solution, vials, and used needles, must follow local requirements for pharmaceutical waste. Used needles and syringes must be placed immediately in a puncture-proof sharps container.

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

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