Susten 100 mg Injection Progesterone Made Simple and Clear
Susten 100 mg Injection (Progesterone) is a prescription hormone shot used to support the luteal phase and stabilize the uterine lining. It’s often part of fertility plans like IUI or IVF, and sometimes used for cycle regulation or early pregnancy support when a clinician confirms low progesterone. The active ingredient is natural progesterone suspended in oil, given as a deep intramuscular injection—usually in the upper outer buttock—by a nurse or a trained caregiver.
In short, Susten 100 mg Injection tops up a hormone your body already makes. When timed right, it helps keep the lining steady and gives your cycle a fair shot at staying on track. This is general information, not medical advice. Always follow your own provider’s plan.
Quick At a Glance Product Snapshot
- What it is: Micronized progesterone 100 mg in oil for injection
- What it does: Stabilizes the endometrium and supports implantation and early pregnancy when prescribed
- Who it’s for: Patients needing luteal phase support or progesterone replacement as decided by a clinician
- How it’s given: Deep intramuscular (IM) injection, typically by healthcare staff or a person trained by your clinic
- Why choose injection: Delivers steady, reliable levels and avoids stomach side effects some people get with oral dosing
Where this Injection Commonly Fits Best
- Luteal phase support in ART cycles like IVF, ICSI, or IUI
- Early pregnancy support when progesterone levels are low or luteal deficiency is suspected
- Secondary amenorrhea or irregular cycles linked to low progesterone
- Protection of the uterine lining when using estrogen in certain protocols (as directed by a specialist)
Your exact use case depends on labs, ultrasound findings, and your treatment plan. It’s not a one-size-fits-all medicine.
How Progesterone Supports Your Cycle Naturally
After ovulation, your body makes progesterone to build and stabilize the uterine lining. If levels dip too soon—or don’t rise enough—the lining can break down, leading to spotting or a short luteal phase. Susten 100 mg Injection adds back progesterone so the lining stays calm, balanced, and ready for implantation when that’s the goal. It doesn’t force ovulation or “boost” eggs; it simply supports the stage that comes after.
Dosing and Administration Basics Explained Clearly
Only your clinician can set the dose and schedule. Common plans in fertility care may include:
- Starting after ovulation, egg retrieval, or embryo transfer
- Injecting once daily, or sometimes every other day, depending on monitoring
- Continuing into early pregnancy if advised (often up to 10–12 weeks), then tapering
Important: Susten 100 mg is usually a deep IM shot into the upper outer gluteal muscle. It should be given by healthcare staff or someone trained by your clinic. Do not self‑inject unless your clinician has taught you how.
What to Expect on Each Injection Day
At the clinic or at home (if trained):
- The site is cleaned with an alcohol swab.
- The injection is placed deep into the muscle, slowly, to reduce soreness.
- Some pressure, warmth, or mild sting is normal.
- A gentle massage or a warm compress afterward can ease discomfort.
- Rotate sides to avoid lumps or tenderness in one spot.
Possible Side Effects and Safety Signals to Watch
Common, usually mild effects:
- Soreness, redness, or a small lump at the injection site
- Feeling sleepy, a bit dizzy, or “off” the next day
- Breast tenderness, bloating, or mild nausea
- Headache or mood shifts
Less common but serious—get medical help right away:
- Signs of a blood clot (leg swelling/pain, chest pain, sudden shortness of breath)
- Severe headache, vision changes, trouble speaking, or one‑sided weakness
- Yellowing of the skin/eyes, severe belly pain, or very dark urine (possible liver issue)
- Severe depression, confusion, or allergic reaction (rash, facial swelling, trouble breathing)
- Persistent hard lumps, significant warmth, or drainage at the site that could suggest infection
If side effects bother you, tell your provider. A small timing change or site rotation can help a lot.
Important Warnings and Who Should Avoid Using it
Do not use without medical approval if you have:
- Unexplained vaginal bleeding not yet evaluated
- Active or past blood clots, stroke, or serious liver disease
- Known or suspected breast cancer or other hormone‑sensitive cancers (unless your specialist approves)
- Allergy to progesterone or any injection excipients (many oil‑based injections use sesame, peanut, or other oils—check your pack)
Pregnancy and breastfeeding:
- Early pregnancy use is common in fertility care, but only continue as your provider directs.
- If you become pregnant, do not stop suddenly without guidance.
- Discuss breastfeeding plans with your clinician.
Drug and Product Interactions that Truly Matter
Progesterone is metabolized in the liver (mainly CYP3A4). Share your full med list with your doctor and pharmacist.
Use caution with:
- Enzyme inducers that may lower levels: rifampin, carbamazepine, phenytoin, St. John’s wort
- Strong inhibitors that may raise levels: ketoconazole, itraconazole, clarithromycin
- Other hormones, especially estrogens—your provider will balance the doses
- Sedatives, sleep aids, alcohol, or cannabis—may increase drowsiness
Storage, Handling, and Simple Travel Pointers
- Keep vials or ampoules at room temperature, away from heat and moisture.
- Protect from light and do not freeze.
- Use only sterile needles and syringes if you were trained to self‑inject.
- Dispose of sharps in an approved sharps container—never in household trash.
- Keep all supplies out of reach of children and pets.
- Bring extra supplies if you’re traveling, plus a small note from your clinic if needed.
Practical Tips to Make Treatment Feel Smoother
- Rotate injection sites and sides to cut down on soreness.
- A warm compress before and after can help the oil base disperse.
- Gentle walking or a short stretch afterward eases stiffness.
- Keep a quick symptom and dosing log; it helps your provider fine‑tune your plan.
- Schedule injections at the same time daily for routine and steady levels.
Frequently Asked Questions About Susten 100 mg Injection
What is Susten 100 mg Injection used for+
It is progesterone used for luteal phase support, early pregnancy support when indicated, and to stabilize the uterine lining in certain hormone protocols
Is the injection better than vaginal gel or capsules+
It depends on your plan and tolerance. Injections give steady levels and avoid stomach upset, but they can be sore. Vaginal forms target the uterus area and may cause less sleepiness. Your provider will choose what fits your protocol
Does the shot hurt a lot+
Most people feel brief pressure or sting, then mild soreness. Warming the area, injecting slowly, and rotating sites helps. If you get severe pain, large lumps, or spreading redness or warmth, contact your clinic
Can I drive after the injection+
Many people can, but progesterone can make you drowsy. See how you feel first and plan your activities accordingly
What if I miss a dose of Susten+
Call your clinic for instructions. Timing matters in fertility cycles, so do not guess or double up unless told to
How long will I stay on it if I am pregnant+
Protocols vary. Many continue until the placenta takes over hormone production, often around 10 to 12 weeks, but only your clinician can decide when to stop
Will Susten 100 mg Injection cause weight gain+
Some people notice fluid retention or bloating. True weight gain varies. Staying active, hydrating, and following your clinic’s advice can help
Is it safe with a peanut or sesame allergy+
Some progesterone injections use oils like sesame or peanut. Always check the ingredient list and inform your healthcare provider before use
Can men use progesterone injections+
Progesterone injections like Susten are generally used for women’s health and fertility protocols. Any off label use should be managed by a specialist
