Susten 400 mg (Progesterone)

Introduction About Susten 400 mg (Progesterone)

Susten 400 mg (progesterone) is a prescribed capsule that provides extra progesterone when your body needs it, like during fertility treatments, to help with hormone balance in some cycle issues and during menopause therapy with estrogen. It helps prepare and maintain the uterine lining. Take only as directed by your clinician.

What Susten 400 mg is used for

Your clinician might prescribe progesterone, such as Susten 400 mg, for a few common situations:

Fertility and assisted reproduction support (luteal phase support): Progesterone helps the uterine lining get into a stable, receptive state. In fertility care, it is often used to support the lining after ovulation induction or embryo transfer, based on the treatment plan.

Progesterone may be prescribed in early pregnancy when low levels are suspected to contribute to specific issues. The appropriate treatment will depend on your history and diagnosis.

Hormone replacement therapy (HRT) with estrogen: If you still have a uterus and are taking estrogen, progesterone is commonly added to lower the risk of estrogen-related overgrowth of the uterine lining.

Cycle-related concerns linked to low progesterone: In certain conditions, progesterone may be used to help regulate bleeding patterns. The exact diagnosis matters here, so dosing and schedule are very individualized.

How it works

Progesterone’s main job is to support and stabilize the uterine lining. Think of it as the hormone that helps the lining shift from “build” mode to “maintain” mode. That is why it shows up so often in fertility plans and in HRT regimens that include estrogen.

How to take it

Susten 400 mg is taken as your prescriber directs, depending on your goal. Capsules may be taken by mouth or vaginally. Follow the label and your prescriber's instructions exactly.

If progesterone causes unusual sleepiness or dizziness, notify your clinician. Many people are advised to take progesterone at night, but always follow your prescribed instructions.

Side effects to know about

Many side effects are dose-related, meaning higher doses can feel “stronger” in your day-to-day life.

Commonly reported side effects may include:

• Sleepiness or fatigue
• Dizziness
• Headache
• Breast tenderness
• Bloating or abdominal discomfort
• Mood changes

Get urgent medical help if you develop symptoms that could suggest a serious problem, such as chest pain, shortness of breath, sudden severe headache, weakness on one side, vision changes, or painful leg swelling. These symptoms can be unrelated, but they should always be checked quickly.

Important safety notes before using progesterone

Tell your clinician if you have (or have had) blood clots, stroke, certain cancers (including breast cancer), liver disease, or unexplained vaginal bleeding.

Furthermore, review all medications and supplements you take. Some drugs can affect hormone levels, including certain seizure medicines and some antibiotics used for specific infections (your prescriber or pharmacist can screen interactions).

Some capsules have oils that can be an issue if you have peanut or soy allergies. Check inactive ingredients for each formulation.

Available Strengths

Susten may be available in multiple strengths depending on supply and prescribing needs, commonly including the following:

• Susten 100 mg (progesterone)
• Susten 200 mg (progesterone)
• Susten 300 mg (progesterone) is available, but its availability may vary.
• Susten 400 mg (progesterone)

Your prescriber chooses the strength based on your condition, monitoring, tolerance, and body response.

Substitutes / Alternatives

Substitution depends on why you are using progesterone (fertility support vs HRT vs bleeding control). These are common alternatives your clinician may consider:

Micronized progesterone (same hormone, different brands/forms):

• Gestoford 200 mg (Progesterone)
• Gestone 200 mg (Progesterone)
• Prometrium (micronized progesterone capsules)
• Generic micronized progesterone capsules

Vaginal progesterone options (often used in fertility care):

• Crinone (progesterone vaginal gel)
• Endometrin (progesterone vaginal insert)
• Compounded progesterone suppositories (quality can vary by pharmacy and state rules)

Injectable progesterone (different form):

• Progesterone in oil (IM injection, typically compounded or specific generics depending on availability)

Other progestins (not the same as progesterone):

• Some progestins may be used for certain bleeding or hormone therapy needs but are not identical to micronized progesterone. Your clinician will decide what fits your situation.

FAQs

What should I do if I miss a dose of Susten 400 mg?

Follow your prescriber’s instructions for missed doses because timing can matter, especially in fertility plans. If you were not provided guidance, contact your clinic or pharmacist. Do not double up unless you are specifically told to.

Can I drink alcohol while taking progesterone?

Alcohol can increase drowsiness or dizziness. Keep intake modest and check with your prescriber.

Do I need to refrigerate Susten 400 mg?

Usually, capsules are stored at a controlled room temperature, away from heat and moisture, but storage can vary by product and packaging. Please refer to the label on your dispensed pack and adhere to its instructions precisely.

Can I open the capsule and mix it with food?

Do not open or crush it unless your pharmacist confirms it is appropriate. Changing the capsule can affect how the medication absorbs or irritates tissues if used differently than intended.

Will progesterone affect a pregnancy test result?

Progesterone does not typically cause a false positive on standard urine pregnancy tests. False positives are more commonly related to fertility medications that contain hCG or certain rare medical situations. If results are confusing, a blood test ordered by your clinician is the clearest next step.