Susten (Progesterone)

Introduction About Susten (Progesterone)

Susten (Progesterone) is a prescription medicine containing progesterone, a natural hormone the body normally produces.

Progesterone plays a big role in preparing the uterus for pregnancy and helping keep the uterine lining stable. When progesterone levels are low or need support, clinicians may prescribe progesterone to help regulate bleeding patterns, support the luteal phase, or as part of assisted reproductive treatment plans.

What Susten (Progesterone) is used for

Progesterone is used in different ways depending on the reason it’s prescribed and the treatment plan. Susten is commonly considered in situations like:

• Luteal phase support in fertility cycles, including some IUI or IVF protocols (based on a clinician’s plan)
• Support of the uterine lining when progesterone is needed after ovulation or embryo transfer
• Certain menstrual or bleeding pattern issues where progesterone support is appropriate
• Hormone therapy plans where progesterone is used alongside estrogen for people who still have a uterus (this helps lower the risk of estrogen-related overgrowth of the uterine lining)

The exact use matters because progesterone dosing and timing can vary significantly for fertility support versus cycle regulation. Your prescriber will typically tailor it to your cycle day, lab results, ultrasound findings, and symptoms.

How it works

Progesterone helps shift the uterine lining into a more stable, “ready” state after ovulation. If pregnancy occurs, progesterone helps maintain that lining.

If pregnancy does not occur, progesterone levels naturally fall, and a period starts. When the body is not producing enough progesterone, or when extra support is needed for treatment, progesterone medication helps mimic that natural hormone signal.

How it is usually taken

Dosage is not one-size-fits-all. Progesterone can be prescribed:

• Once daily or twice daily
• On specific cycle days only (for example, after ovulation)
• Continuously for a set number of weeks in some fertility protocols

Some people are instructed to take micronized progesterone at bedtime because it can cause drowsiness or dizziness in certain individuals. If your clinician instructs vaginal use (sometimes done in fertility care), it may reduce some whole-body side effects, but local irritation or discharge can occur.

Only take Susten (Progesterone) exactly as prescribed. Changing the dose or stopping early can affect cycle timing or treatment outcomes.

What you might notice while using it

Experiences vary, but common reports include:

• Sleepiness or feeling “off” mentally, especially with oral dosing
• Breast tenderness
• Bloating
• Mood changes
• Spotting or changes in bleeding pattern (this can happen depending on timing and the reason it’s prescribed)

If you have heavy bleeding, severe pelvic pain, chest pain, shortness of breath, sudden severe headache, or one-sided leg swelling, seek urgent medical care. Those symptoms need immediate evaluation.

Side effects and safety considerations

Possible side effects can include drowsiness, dizziness, headache, nausea, constipation, breast tenderness, and spotting. Some people are more sensitive than others.

Tell your prescriber about your medical history, especially if you have had:

• Blood clots, stroke, or clotting disorders
• Liver disease
• Unexplained vaginal bleeding
• Certain hormone-sensitive cancers (or a strong history)

Also, share a full medication list. Progesterone can interact with some medicines that affect liver metabolism (including certain seizure medications and some antibiotics or antifungals). Your clinician may adjust dosing or monitoring based on what you take.

Available strengths and dosage forms

Susten (Progesterone) is most commonly seen as micronized progesterone capsules, and many suppliers carry:

• Susten 100 mg
• Susten 200 mg
• Susten 300 mg
• Susten 400 mg

Depending on the source and prescribing plan, progesterone may also be available in other forms (availability varies by manufacturer and market), such as vaginal preparations or progesterone injections. If your prescription specifies a route (oral vs vaginal), follow that exactly since absorption and expected effects can differ.

Substitute Options

If Susten (Progesterone) is not available or your prescriber prefers a different option, common substitutes may include:

• Generic micronized progesterone capsules (same active hormone; may differ by manufacturer)
• Prometrium (brand micronized progesterone capsule)
• Endometrin (progesterone vaginal insert)
• Susten 8% Vaginal gel (Progesterone)
• Susten SR 400 mg (Progesterone) Tablet
• Susten SR 300 mg (Progesterone) Tablet
• Susten SR 200 mg (Progesterone) Tablet
• Susten 100 mg Injection (Progesterone)
• Susten 200 mg Injection (Progesterone)
• Susten Injection (Progesterone)
• Susten VT 200 Mg (Progesterone) Tablet

Synthetic progestins (such as medroxyprogesterone acetate) are also used for certain cycle-related indications, but they are not identical to progesterone. Substitution should be clinician-guided based on your diagnosis and treatment goal.

FAQs

1. How should Susten (Progesterone) be stored?

Store at room temperature, away from moisture and direct heat. Keep it in its original packaging and out of reach of children.

2. What should I do if I miss a dose?

Follow your prescriber’s instructions. If you don’t have specific guidance, contact the pharmacy or your clinician. Do not double up unless you are specifically told to.

3. Can Susten (Progesterone) affect pregnancy test results?

Progesterone does not typically cause a false positive pregnancy test. Pregnancy tests measure hCG, not progesterone.

4. Can I drink alcohol while taking progesterone?

Alcohol can worsen dizziness or sleepiness for some people taking progesterone. If you choose to drink, consider limiting it and pay attention to how you feel. Ask your prescriber if you’re unsure.

5. Does progesterone cause weight gain?

Some people notice fluid retention or bloating, especially early on. True fat-related weight gain is not guaranteed and varies by dose, duration, and individual response. If it feels significant, discuss it with your clinician.