Susten 300 mg (Progesterone)

Information About Susten 300 mg (Progesterone)

Susten 300 mg (progesterone) is a progesterone medicine most often used when your natural progesterone level is too low or needs support for a specific treatment plan.

Progesterone is one of the key hormones that regulate the menstrual cycle and support the uterine lining (endometrium).

When progesterone is low at the wrong time, it can lead to irregular bleeding patterns, missed periods, or difficulty maintaining the uterine lining the way your clinician wants during fertility treatment.

Susten 300 mg (progesterone) is used for various medical purposes.

Your prescriber may recommend progesterone for several reasons, depending on your symptoms, lab results, ultrasound findings, and overall plan of care. Common medical uses include:

• Progesterone support in fertility care (often called luteal phase support)
• Irregular periods linked to hormone imbalance
• Secondary amenorrhea (missed periods not caused by pregnancy)
• Hormone therapy (HRT) plans typically include progesterone to balance estrogen in people who still have a uterus.

The exact reason matters because it affects the dose, the timing in your cycle, and how long you stay on treatment.

How it works

Susten 300 mg (progesterone) mimics what the ovaries do after ovulation. It signals the uterus to build and maintain a lining for pregnancy or more predictable bleeding. In hormone therapy, progesterone helps lower the risk of estrogen-related overgrowth of the uterine lining.

How to take it

Always follow your prescription directions. Timing matters; many are told to take it in the evening due to possible drowsiness.

General tips that are often relevant (your prescription instructions still come first):

• Take it at the same time each day.
• If it makes you sleepy, ask your prescriber if bedtime dosing is appropriate.
• Swallow capsules/tablets as directed. If your specific product is labeled sustained-release (SR), do not crush or chew it.
• If you miss a dose, follow your prescriber’s advice. If you are unsure, ask a pharmacist what is safest based on your schedule.

Side effects of Susten 300

Not everyone gets side effects, but it helps to know what is common vs. what should trigger a call for medical help.

More common side effects:

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

Call your prescriber promptly or seek urgent care if you have symptoms that could signal a serious reaction, such as chest pain, shortness of breath, one-sided leg swelling, severe headache, vision changes, or signs of an allergic reaction (hives, facial swelling, trouble breathing). Progesterone is not the only factor in clot risk, but your personal history matters a lot.

Who should be cautious before using progesterone?

Tell your prescriber if you have (or had) any of the following, as it may affect progesterone’s appropriateness or your monitoring:

• Blood clots, stroke, or clotting disorders
• Breast cancer or hormone-sensitive cancers
• Unexplained vaginal bleeding
• Liver disease
• Severe depression or significant mood disorders
• Migraine with neurologic symptoms, depending on your history

Interactions to be aware of

Some medicines can change how progesterone is processed in the body, which can affect how well it works or increase side effects. Share a complete medication list, including supplements.

Examples that may matter include:

• Certain seizure medicines (some can reduce hormone levels)
• Rifampin and other strong enzyme inducers
• Some antifungals or antibiotics can raise hormone levels.
• Alcohol or other sedating medicines, which can worsen drowsiness

Available strengths (other dosages)

Susten is commonly seen in multiple strengths. Availability can vary by supplier:

• Susten 100 mg (Progesterone)
• Susten 200 mg (Progesterone)
• Susten 300 mg (Progesterone)
• Susten 400 mg (Progesterone)
• Susten VT 200 Mg (Progesterone) Tablet
• Susten 200 mg Injection (Progesterone)
• Susten SR 400 mg (Progesterone) Tablet
• Susten Injection (Progesterone)
• Susten 100 mg Injection (Progesterone)
• Susten 8% Vaginal gel (Progesterone)

Your clinician may choose a lower or higher strength based on your indication, tolerance, and treatment protocol.

Substitute options on the market (ask your prescriber first).

If Susten 300 mg (progesterone) is unavailable or another form is needed, prescribers may suggest alternatives. Formulation and route can affect interchangeability.

Common alternatives include:

• Micronized progesterone capsules (generic)
• Prometrium (brand micronized progesterone)
• Vaginal progesterone options (often used in fertility care), such as Endometrin or Crinone
• Synthetic progestins are used for some similar conditions, such as medroxyprogesterone acetate (for certain cycle issues). These differ from progesterone and are selected based on clinical goals.

FAQs

1. Is progesterone the same thing as a progestin?

Not exactly. Progesterone is the hormone your body naturally makes. Progestins are synthetic, progesterone-like medicines. They can overlap in use, but they are not identical in their effects or side-effect profiles.

2. Can Susten 300 mg (progesterone) affect a home pregnancy test?

Progesterone typically does not cause a false positive pregnancy test. Those tests detect hCG, not progesterone. If you are taking fertility injections that contain hCG, that is a different situation and can affect results.

3. What if I have a peanut allergy?

Some progesterone capsules (depending on the manufacturer) may contain peanut oil or other oils. Do not guess. Check the ingredient list on your specific product packaging and confirm with a pharmacist.

4. Can men be prescribed progesterone?

Sometimes, yes, but it is much less common and is very condition-specific. If prescribed, dosing and monitoring are individualized. It should not be self-started.

5. Do I need to taper progesterone, or can I stop it suddenly?

It depends on why you are taking it. In fertility and some pregnancy-related protocols, stopping timing can be important. In other cases, a taper is not necessary. Your prescriber should tell you exactly how to stop based on your plan.