Testosterone buccal system

Drug Overview

In the field of Endocrinology, achieving stable hormonal balance is essential for patients with androgen deficiencies. Traditional methods of Hormone Replacement Therapy, such as injections, can often lead to erratic “peaks and valleys” in hormone levels. The testosterone buccal system is a specialized delivery method designed to provide a steady, continuous release of the hormone, mimicking the body’s natural circadian rhythm more closely than many other formulations.

This medication is categorized as an Androgen. It utilizes a unique mucoadhesive technology that adheres to the gum, allowing the hormone to be absorbed directly into the systemic circulation through the oral mucosa.

• Generic Name / Active Ingredient: Testosterone
• US Brand Name: Striant
• Drug Class: Androgen; Schedule III Controlled Substance
• Route of Administration: Buccal (transmucosal)
• FDA Approval Status: Fully FDA-approved for replacement therapy in adult males for conditions associated with a deficiency or absence of endogenous testosterone.

What Is It and How Does It Work? (Mechanism of Action)

The testosterone buccal system acts as a bioidentical Hormone Replacement Therapy. Unlike oral testosterone tablets, which are largely destroyed by the liver (the “first-pass effect”), the buccal system allows testosterone to bypass the liver by absorbing directly through the thin tissues of the mouth.

Molecular and Hormonal Level

The system consists of a small, tablet-like mucoadhesive that is placed on the gum above the incisor tooth.

1. Transmucosal Absorption: Upon contact with saliva, the system softens and adheres to the gum. It slowly releases testosterone, which diffuses through the oral mucosa into the superior vena cava, entering the bloodstream directly.
2. Continuous Delivery: This delivery provides a sustained release over 12 hours, maintaining serum testosterone concentrations within the physiological range ( 300  to  1050  ng/dL) throughout the day.
3. Androgen Receptor Binding: Once in the blood, testosterone binds to specific Androgen Receptors in target tissues (such as muscle, bone, and the central nervous system).
4. Genomic Regulation: The hormone-receptor complex enters the cell nucleus and triggers the transcription of genes that regulate male secondary sexual characteristics, enhance protein synthesis for muscle growth, and maintain Bone Mineral Density (BMD).

By providing a stable baseline, the buccal system restores the natural metabolic and androgenic environment, improving mood, libido, and body composition.

FDA-Approved Clinical Indications

Primary Indication

The primary use of the testosterone buccal system is for replacement therapy in adult males for conditions associated with a deficiency or absence of endogenous testosterone:

• Primary Hypogonadism: Testicular failure due to cryptorchidism, bilateral torsion, orchitis, or Klinefelter’s syndrome.
• Hypogonadotropic Hypogonadism: Failure of the pituitary gland or hypothalamus to produce the signals required for testosterone production.

Other Approved & Off-Label Uses

• Constitutional Delay of Puberty: Occasionally used in adolescent males to induce masculine physical changes under expert supervision.
• Gender-Affirming Care: Utilized as a Targeted Therapy for hormonal transition in transgender men.

Primary Endocrinology Indications:

• Androgen Restoration: Normalizing serum testosterone levels to improve sexual function and energy.
• Metabolic Support: Improving Insulin Sensitivity and reducing the accumulation of visceral fat associated with low testosterone.

Dosage and Administration Protocols

The testosterone buccal system is designed for twice-daily application to ensure 24-hour coverage.

Indication	Standard Dose	Frequency
Male Hypogonadism	30 mg (one system)	Twice daily (Every 12 hours)

Administration Timing and Technique

• Placement: The system should be placed on the gum in the small depression above the left or right upper incisor (front tooth).
• Rotation: Each time a new system is applied (every 12 hours), the side of the mouth should be rotated (e.g., morning on the left, evening on the right).
• Adhesion: The user should press the system firmly against the gum with a finger for 30 seconds to ensure it sticks.
• Activities: Users can eat, drink, and brush their teeth normally; however, care should be taken not to dislodge the system with the tongue or toothbrush.

Dosage must be individualized by a qualified healthcare professional.

Clinical Efficacy and Research Results

Clinical research from the 2020–2026 era continues to validate the buccal system’s ability to maintain stable hormone levels compared to gels or injections.

• Serum Stability: In clinical trials, approximately  80\%  to  90\%  of men achieved average serum testosterone levels within the normal range within the first month of therapy.
• Bone Health: Research indicates that maintaining stable testosterone levels via buccal delivery results in a mean increase in Bone Mineral Density (BMD) of  1\%  to  2\%  annually in hypogonadal men.
• Lean Body Mass: Patients typically see a mean increase in lean body mass of  1.5  to  2.5  kg over six months, with a corresponding decrease in body fat percentage.

Safety Profile and Side Effects

NO BLACK BOX WARNING

Unlike topical gels, the buccal system does not carry a Black Box Warning for secondary transfer, as the hormone is contained within the mouth and does not leave a residue on the skin.

Common Side Effects (> 10\% )

• Gum Irritation: Tenderness, swelling, or redness at the site of application.
• Taste Alteration: A bitter or medicinal taste in the mouth.
• Gingivitis: Inflammation of the gums, particularly if the system is not rotated properly.

Serious Adverse Events

• Polycythemia: Increased red blood cell count (Hematocrit), which requires regular monitoring.
• Prostate Health: Potential to worsen symptoms of Benign Prostatic Hyperplasia (BPH); PSA levels must be monitored to screen for occult prostate cancer.
• Cardiovascular Risks: Potential increased risk of heart attack or stroke in men with established heart disease.
• Sleep Apnea: Possible worsening of pre-existing sleep apnea.

Research Areas

Direct Clinical Connections

Active research (2025–2026) is focusing on the interaction between stable testosterone delivery and the Hypothalamic-Pituitary-Adrenal (HPA) Axis. By avoiding the “spikes” of injections, researchers are studying if the buccal system more effectively regulates the body’s cortisol response and improves overall Insulin Sensitivity.

Generalization & Advancements

The development of Novel Delivery Systems, such as biodegradable buccal films that dissolve completely after releasing the hormone, is a major focus of current innovation. Additionally, research into Biosimilars and standardized generics for buccal delivery aims to make this method more accessible globally.

Patient Management and Clinical Protocols

Pre-treatment Assessment

• Baseline Diagnostics: Two separate morning total testosterone levels.
• Organ Function: Liver function tests (LFTs) and lipid profile.
• Screening: PSA level and Digital Rectal Exam (DRE) to assess prostate health.
• Dental Screening: A baseline gum and oral health exam is recommended before starting buccal therapy.

Monitoring and Precautions

• Vigilance: Regular dental check-ups to monitor gum health at the application sites.
• Laboratory Monitoring: Periodic checks of PSA, Hematocrit, and Testosterone levels every 3 to 6 months.
• Lifestyle: Medical Nutrition Therapy (MNT) to support heart health and regular physical activity to maximize androgen benefits.

“Do’s and Don’ts”

• DO rotate the side of your mouth each time you apply a new system.
• DO check to see if the system is still in place after eating or brushing.
• DO report any persistent gum pain or significant changes in taste to your doctor.
• DON’T swallow the buccal system; if swallowed, it will not work properly.
• DON’T use the system if you have severe gum disease or oral infections.

Legal Disclaimer

This guide is for informational purposes only and does not constitute medical advice. Testosterone replacement is a controlled substance and must be managed by a board-certified Endocrinologist or qualified practitioner. Do not start or change your dose without a professional consultation. All data is current as of 2026.