Follitrin

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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 Follitrin

Quick Facts

Property Description
Active Ingredient Follitropin alfa or Follitropin beta
Form Subcutaneous Injection
Pharmacological Class Gonadotropins
Primary Use (Female) Ovarian stimulation for fertility
Primary Use (Male) Inducing sperm production
Origin Recombinant DNA technology (Synthetic/Man-made)

Follitropin is the International Nonproprietary Name (INN) for a key prescription medication used in the treatment of infertility. It is a synthetic, or man-made, version of the naturally occurring human Follicle-Stimulating Hormone (FSH). This hormone is vital for reproductive health, serving as the body's primary messenger to encourage the development of eggs in the ovaries and promote sperm production in the testes.

Follitropin belongs to the gonadotropin class of drugs. This classification is clinically recognized by major pharmacological bodies for its therapeutic role as a fertility agent, stimulating follicle growth. It is essential in major fertility procedures, such as in vitro fertilization (IVF), where it provides a controlled method to mature multiple eggs. It may also be used to induce ovulation in women facing certain functional difficulties in egg release.

Follitropin is manufactured using recombinant DNA technology, which provides a high degree of purity and consistency. This advanced process differentiates it from older, urine-derived hormone preparations. The medication is commonly available under popular brand names such as Gonal-f and Follistim. Because Follitropin is a protein-based hormone, it must be administered as a subcutaneous injection (under the skin) rather than being taken orally.

What side effects are possible with Follitrin?

Possible Side Effects and Safety Information

The safety profile of Follitrin (follitropin) is defined by officially categorized adverse reactions and specific risks associated with its use as a gonadotropin.

Frequency-Classified Adverse Reactions

Adverse reactions are classified by incidence according to regulatory standards. Very common (ge 1 in 10 patients) effects include headache, ovarian cysts, and reactions at the injection site (such as pain, redness, or bruising). Common (ge 1 in 100 patients) reactions include Ovarian Hyperstimulation Syndrome (OHSS), abdominal pain or discomfort, nausea, and fatigue. In men, common effects may include gynecomastia and acne.


Serious Adverse Reactions and Safety Constraints

Official labeling highlights several serious risks. Ovarian Hyperstimulation Syndrome (OHSS) is a serious medical event that can progress rapidly and is potentially life-threatening; severe OHSS is classified as uncommon. Rare but documented serious risks include thromboembolic events (blood clots, such as pulmonary embolism or stroke) and ovarian torsion. These reactions are primarily grouped under the Reproductive System and Vascular disorders in regulatory documents.


Population and Contextual Safety Notes

Follitrin is officially contraindicated in women with primary ovarian failure and men with primary testicular failure. Safety and pharmacokinetics are not established for patients with severe renal or hepatic impairment. The use of this medicine is associated with an increased incidence of multi-fetal gestation (multiple births), ectopic pregnancy, and a higher risk of spontaneous abortion compared to natural conception. OHSS most often occurs seven to ten days following the final hormone administration.

Overdose and Emergency Response

Overdose and When to Seek Help

The regulatory profile for Follitrin (follitropin alfa) defines the primary consequence of an overdose in women as Ovarian Hyperstimulation Syndrome (OHSS), resulting from an excessive response to the medication. For men, no specific acute overdose syndrome is documented.

Documented Manifestations and Serious Outcomes

OHSS can present with severe abdominal pain and distension, significant weight gain, nausea, vomiting, and shortness of breath (dyspnoea). Officially documented severe outcomes linked to OHSS include rare but life-threatening complications like thromboembolic events (e.g., pulmonary embolism, stroke) and acute pulmonary distress.

Mandatory Emergency Actions

If signs of an excessive ovarian response are detected, the official instructions require the treating physician to stop Follitrin treatment and withhold the administration of hCG. Since no specific antidote is available, treatment is primarily symptomatic, focusing on fluid and electrolyte balance, and requires continuous monitoring.

When to Seek Urgent Medical Attention

Patients are instructed to seek immediate medical attention for symptoms such as severe or persistent pain in the pelvic or abdominal area, vomiting, or dyspnoea. If severe OHSS is diagnosed, the regulatory documents state that hospitalization is required for observation and supportive care.

Therapeutic Uses of Follitrin

Quick Facts

  • Support for Ovulation: Utilized to support the development of eggs in women who experience anovulatory infertility.
  • Assisted Reproduction: Used as part of protocols for assisted reproductive technology (ART), such as in vitro fertilization (IVF), to support the development of multiple follicles.
  • Male Reproductive Health: May be used to induce sperm production in men with specific hormonal conditions (hypogonadotropic hypogonadism).

What Follitrin Treats: Main Uses and Benefits

Follitrin (follitropin alfa) is a prescription medication used in the therapeutic management of infertility in both women and men. It functions as a fertility agent that supports normal processes within the reproductive system.

Uses in Women

This medication is primarily indicated for two specific uses in women who do not experience primary ovarian failure:

  1. Ovulation Induction: Follitrin is utilized to promote the development and maturation of ovarian follicles, which is essential for inducing ovulation and achieving pregnancy in women with oligo-anovulatory infertility.
  2. Assisted Reproductive Technology (ART): It is administered to support the development of multiple ovarian follicles in women undergoing an ART cycle, such as in vitro fertilization, to optimize the retrieval of oocytes.

Uses in Men

Follitrin is also applied in male reproductive health to support spermatogenesis (sperm production) in men diagnosed with certain forms of hypogonadotropic hypogonadism. This treatment is typically initiated in conjunction with other hormonal therapy.

Eligibility and Restrictions for Use

Who Can and Cannot Use Follitrin? (Official Eligibility)

The eligibility for Follitrin (follitropin alfa/beta) is strictly defined by official regulatory documentation, focusing on the patient’s existing reproductive status and general health. The medication is only indicated for adult females with oligo-anovulatory infertility or those undergoing Assisted Reproductive Technology (ART), and for adult males with confirmed hypogonadotropic hypogonadism.

Contraindicated Populations

Follitrin must not be used by individuals who have a known hypersensitivity to the drug or by patients with sex hormone-dependent tumors of the pituitary, hypothalamus, or reproductive organs. It is also prohibited for women with Primary Ovarian Failure (high FSH levels), men with Primary Testicular Failure, and women with uncontrolled non-gonadal endocrine conditions.

Age and Condition Restrictions

Follitrin is contraindicated during pregnancy and not recommended while breastfeeding. Use is not established or not indicated for the pediatric or geriatric populations. Additionally, safety and efficacy data are not established for patients with severe renal or hepatic impairment, meaning use in these groups is restricted by official labeling.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Follitrin (follitropin) exhibits an interaction profile that is primarily characterized by effects within the reproductive hormone axis rather than through common metabolic pathways.

Pharmacokinetic Interaction Data

Official regulatory documents state that no formal drug-drug interaction studies have been conducted for Follitrin. As a recombinant protein hormone, Follitrin is not metabolized through the Cytochrome P450 (CYP) enzyme system, meaning there are no documented pharmacokinetic interactions related to altered drug clearance or exposure (AUC/Cmax).

Pharmacodynamic and Procedural Constraints

The documented interactions are pharmacodynamic in nature and reflect requirements of the fertility treatment regimen:

  • Gonadotropin-Releasing Hormone (GnRH) Agonists/Antagonists: When Follitrin is co-administered with GnRH agonists or antagonists—used for pituitary suppression—the official labels indicate that a higher total dose of Follitrin may be needed to achieve an adequate ovarian follicular response. This modifies the biological effect, not the clearance.

  • Human Chorionic Gonadotropin (hCG): The use of hCG is required for the final stages of the treatment. Regulatory instructions specify that hCG must be administered 24 to 48 hours following the final Follitrin injection to complete follicular maturation.

No interactions with food, alcohol, or herbal products have been established in official government prescribing information.

Mechanism of Action

Follitrin operates within the mechanistic domain of receptor-mediated signaling by acting as a selective negative allosteric modulator (NAM) on the Regulator-X Receptor (RX). This targeted action reduces the receptor's sensitivity to its natural signals, initiating a reduction in the signaling output from the RX receptor at the cellular level.

The reduction in RX activity triggers a cascade effect, leading to a decrease in downstream molecular signaling within the cAMP/PKA pathway. By modifying these early molecular steps, Follitrin modifies the internal transmission of the heightened signaling, influencing subsequent pathway activity.

Follitrin's effect on both the receptor and the signal cascade modulates the activity of overactive neural and humoral pathways. This engagement of key mechanisms influences the activity level of the overall feedback loop, affecting the subsequent physiological responses that arise from pathway engagement within the targeted systems.

Dosage and Administration Information

Administration Overview

Follitrin is intended for subcutaneous or intramuscular administration. The choice of injection site and the specific technique used contribute to the effective delivery of the medication. Common injection sites include the abdomen or the upper thigh.

Preparation and Handling

The medication typically requires careful preparation before use. If the product is provided in a powder form, it must be reconstituted with the provided solvent. It is important to ensure that the resulting solution is clear and free of particles. Once prepared, the solution should be used immediately.

Self-Administration Process

For patients who will be performing the injections at home, thorough training on the following steps is necessary:

  • Site Rotation: It is a standard practice to rotate the injection site with each dose to minimize skin irritation or tissue changes.
  • Aseptic Technique: Maintaining cleanliness is essential. This includes washing hands thoroughly and cleaning the injection site with an antiseptic swab.
  • Needle Disposal: Used needles and syringes must be placed in a puncture-resistant container immediately after use to ensure environmental safety.

Storage Requirements

Proper storage is necessary to maintain the integrity of the medication. Follitrin should generally be stored in its original packaging to protect it from light. Temperature requirements—whether refrigeration or room temperature—must be strictly followed as indicated on the product labeling. Any unused portion of the medication should be discarded according to local guidelines.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Follitrin


Evidence for Controlled Ovarian Stimulation in ART Cycles

Research into Follitrin's role during Assisted Reproductive Technology (ART) procedures, such as In Vitro Fertilization (IVF), has been widely studied, with numerous large trials, including Randomized Controlled Trials (RCTs) and subsequent systematic reviews. These studies explored the use of Follitrin in women undergoing ovarian stimulation protocols, monitoring outcomes like the total Number of Oocytes Retrieved and the frequency of women achieving an Ongoing Pregnancy or Live Birth. Studies reported measurements showing follicular development and egg yield were observed in the groups that received Follitrin. Comparative trials have examined Follitrin against other recombinant and non-recombinant gonadotropins, and findings varied across studies.

Evidence for Inducing Ovulation

For women facing infertility because they do not ovulate regularly, often including those with Polycystic Ovary Syndrome (PCOS), Follitrin was evaluated in research exploring the induction of egg maturation and release. The evidence comes from controlled clinical trials and RCTs designed to evaluate follicular development in these patient groups. These studies monitored the drug's effect on achieving follicular growth and subsequent ovulation. Research highlights changes measured during the study period, describing patterns of follicular maturation observed in the tested women. The available data provides limited characterization of the outcomes over extended periods following treatment compared to the short-term biological response.

Evidence for Spermatogenesis in Men

Follitrin was evaluated in a specific population of adult men diagnosed with Hypogonadotropic Hypogonadism (HH). Research examined the use of Follitrin and its association with spermatogenesis (sperm production). Due to the rarity of the condition, the evidence base is primarily derived from long-term, open-label clinical trials. Researchers monitored outcomes such as the time needed for sperm to appear in the ejaculate, the subsequent increase in sperm concentration, and changes in testicular volume. Trials described patterns related to the evolution of spermatogenesis in the men with HH during the extended treatment period.


Research Gaps and Areas of Uncertainty

A transparent review of the research indicates several areas where certainty remains low or data are still emerging. The evidence quality varies across studies, and many findings describe group patterns, not personal outcomes. The most consistent research limitation frames include that follow-up durations were limited in many female fertility studies, meaning extended follow-up of measured outcomes are not fully established. Additionally, comparative evidence is lacking in several areas, and sample sizes were modest in the male fertility studies due to the rarity of the condition. The research highlights what is known—and what is still uncertain—about Follitrin's role in the broader landscape of infertility treatment.

Key Studies & References

  1. Follicle-stimulating hormone for the treatment of hypogonadotropic hypogonadism in men: a meta-analysis.
  2. NICE Guideline: Fertility problems: assessment and treatment (update)

Frequently Asked Questions (FAQ)

Common questions about Follitrin (FAQ)

Q: Does Follitrin cause long-term side effects that I should be aware of?

Official documents describe risks associated with use that may include long-term or delayed consequences. Regulatory documents indicate that the use of Follitrin is associated with an increased incidence of multiple births, ectopic pregnancy, and spontaneous abortion. Rare, serious events like thromboembolic events (blood clots) are also highlighted, and some research has examined an increased risk of ovarian cancer in women who received the treatment more than one time.

Q: Is it common for people to experience swelling or bruising where Follitrin is administered?

According to official labeling, local reactions at the injection site are classified as a very common adverse effect of Follitrin. These reactions typically include pain, redness, or bruising at the site. Swelling at the injection site is also listed in some regulatory documents as a less common or known local reaction.

Q: Is Follitrin described as having interactions with any common supplements like vitamins or herbal remedies?

Official regulatory documents state that no formal drug-drug interaction studies have been conducted for Follitrin. Furthermore, no interactions with food, alcohol, or herbal products have been established in official government prescribing information.

Q: How long does it typically take for Follitrin to start having an effect?

Follicle development, the primary biological effect of the medicine, is described in regulatory documents as occurring within the cycle of use. The dose is typically initiated and monitored over a period of at least seven days until an adequate response is observed.

Q: What is the general duration of Follitrin treatment, based on available research?

Regulatory information indicates that the duration of treatment is variable and depends on the specific reason for use. For ovulation induction, treatment is typically started daily for about 14 days. For Assisted Reproductive Technology (ART), therapy generally does not exceed 10 days, while treatment for spermatogenesis in men can be extended for up to 18 months.

Q: Is it normal to feel a mild headache when first starting Follitrin?

Headache is listed as a very common adverse reaction in regulatory documents associated with the use of this medicine. Regulatory documents classify headache as a very common adverse reaction, which is associated with the use of this medicine.

Q: Is Follitrin available in different forms or only as an injection?

Follitrin is only administered as a subcutaneous injection (under the skin). It is supplied either as a sterile, lyophilized powder (a dry powder) that must be prepared by mixing with a solvent, or in pre-filled pens containing the ready-to-use solution.

Q: Does Follitrin interact with oral contraceptives?

Official regulatory documents state that no formal drug-drug interaction studies have been conducted for Follitrin. The established pharmacodynamic interactions relate primarily to other fertility medicines, such as GnRH agonists/antagonists and hCG, which are used to control the reproductive cycle.

Q: What are the common expected outcomes described in the studies for Follitrin?

Research studies track biological effects, such as the number of oocytes retrieved and the development of follicles. In women, research also monitors patient-level outcomes like the rate of clinical or ongoing pregnancy and the live birth rate. In men, studies track changes in sperm concentration.

Q: Are there any recently published studies about Follitrin's effects?

Research in the area of gonadotropin treatment, which includes Follitrin (follitropin), is ongoing. New clinical trials and systematic reviews are frequently published to examine the drug’s effects and safety profile, often in comparison to other similar preparations.

Q: Is Follitrin considered a high-risk medication by regulatory bodies?

Regulatory bodies define the risk profile through a list of Serious Adverse Reactions in the official label. For Follitrin, this includes life-threatening conditions such as severe Ovarian Hyperstimulation Syndrome (OHSS) and rare thromboembolic events (blood clots). Regulatory documents indicate that this risk profile necessitates prescription by experienced physicians who must ensure appropriate monitoring.

Q: Are there any long-term monitoring requirements described for people who use Follitrin?

Regulatory information states that monitoring procedures are necessary to check for an adequate response and to monitor for any unwanted effects throughout treatment. The required monitoring may involve clinical tools such as blood tests, semen testing, and ultrasound examinations during the course of treatment.

Q: What are the official sources for patient information leaflets (PILs) for Follitrin?

The official patient information leaflets (PILs) and Instructions for Use are required to be included within the drug packaging. They are also publicly available from the manufacturer's official product website and the regulatory body’s public database, such as the FDA’s DailyMed or the EMA’s SmPC.

Q: Does Follitrin have a Risk Evaluation and Mitigation Strategy (REMS) program?

Follitrin (follitropin alfa/beta) is not currently subject to a Risk Evaluation and Mitigation Strategy (REMS) program mandated by the U.S. Food and Drug Administration (FDA).

Q: Has Follitrin been approved in other countries besides the US/Europe?

Yes, Follitrin (follitropin) is a globally recognized medicine. It has received regulatory approval for its indicated uses from major health authorities, including the U.S. Food and Drug Administration (FDA), the European Medicines Agency (EMA), and agencies in Canada, Australia, and Japan.

Q: Are the effects of Follitrin permanent after the treatment course is finished?

Follitrin is a hormone that provides a temporary signal to the body to stimulate a reproductive process. Because of its mechanism, its biological effects are generally not described in regulatory documents as permanent after the treatment course is completed.

Q: What are the typical financial assistance options for Follitrin mentioned by patient groups?

The drug’s manufacturer often provides information regarding patient support programs for those who are eligible. These programs are usually designed to assist self-paying patients with the out-of-pocket costs for the medication.

Q: Is it common for a person to gain or lose weight while using Follitrin?

Regulatory documents list rapid weight gain as a symptom associated with the development of Ovarian Hyperstimulation Syndrome (OHSS), which is a common adverse reaction of the medicine. Regulatory documents list weight gain associated with Ovarian Hyperstimulation Syndrome (OHSS); weight loss is not listed as a common or very common adverse reaction.

Q: Why is Follitrin sometimes referred to by a different name in other countries?

Follitrin is the medicine’s chemical name (International Nonproprietary Name - INN). To allow for consistent identification globally, each medicine has an INN. However, it is sold under various different trade or brand names in different countries, such as Gonal-f or Follistim.

Q: Is Follitrin ever prescribed for conditions other than the main one listed?

The official label and regulatory documents are limited to describing the use of Follitrin for its labeled indications. These indications are specific to inducing ovulation and supporting Assisted Reproductive Technology (ART) in women, and stimulating sperm production in men with specific hypogonadism.

Q: What is the definition of the condition Follitrin is used to treat, in simple terms?

Follitrin is officially indicated for the treatment of infertility in women who experience problems with ovulation (the release of an egg), and in men with specific hormonal conditions that result in low sperm counts.

Q: What is the guidance on traveling with Follitrin, especially if it needs refrigeration?

Follitrin must be transported under its required storage conditions, which include refrigeration at 2 C to 8 C and protection from freezing. Official guidance for transporting medication often recommends keeping the medication in its original container and carrying a copy of the prescription or a doctor’s note.

How should Follitrin be stored and disposed of?

Storage and Disposal Requirements

Follitrin (follitropin alfa) must be stored under specific, regulated conditions.

Storage Requirements

Condition Unopened Lyophilized Powder Reconstituted Solution
Temperature 2 C to 25 C (36 F to 77 F) Refrigerated at 2 C to 8 C (36 F to 46 F)
Stability Until expiration date Discard after 28 days

Store the product in its original carton to protect it from light and do not freeze. After reconstitution, keep the vial tightly closed. All medication must be kept out of the reach and sight of children.

Disposal Instructions

Discard unused or expired medication according to local regulations. All used needles and syringes (sharps) must be placed immediately in an FDA-cleared sharps disposal container.

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

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