Susten 100 mg Injection (Progesterone)

Intro About Susten 100 mg Injection (Progesterone)

Susten 100 mg Injection (Progesterone) is used when a clinician wants to raise or support progesterone levels in the body.

Progesterone is a natural hormone that helps prepare the uterine lining and supports normal menstrual cycling.

When progesterone is low or fluctuating at the wrong time, it can affect cycle regularity and may impact fertility treatment plans.

What Susten 100 mg Injection is commonly prescribed for

Doctors may prescribe progesterone injections for a few different reasons, depending on your diagnosis and lab results. Common situations include:

• Luteal phase support in fertility care, including some IVF and assisted reproduction protocols, where progesterone is used to support the uterine lining after ovulation or embryo transfer.
• Hormonal imbalance–related menstrual concerns, such as certain cases of irregular periods or abnormal uterine bleeding, where progesterone support is part of the plan.
• Progesterone supplementation is used when a provider believes your body is not producing enough on its own at the needed time.

Your exact reason matters because it affects the dose, schedule, and how long you may need treatment.

How is it given

Susten 100 mg is an intramuscular progesterone injection, meaning it is injected deep into a muscle. Many progesterone injections are oil-based and can feel thick, so technique and proper needle selection matter. It is typically administered by a healthcare professional or under guidance if your care team trains you to do it safely.

Dosing basics (why your schedule may look different from someone else’s)

Progesterone dosing is not one size fits all. Your prescriber may base your plan on:

• The goal of treatment (fertility support vs cycle management)
• Where are you in your cycle or treatment timeline?
• Ultrasound and lab monitoring (common in fertility care)
• Your symptoms and prior response to progesterone

Some protocols use progesterone daily for a set period, while others use it on specific days. Do not change the timing or stop early unless your prescriber tells you to, especially in fertility cycles where timing is tightly coordinated.

Possible side effects

Many people tolerate progesterone, but side effects can happen. Commonly reported effects include:

• Pain, swelling, redness, or a lump at the injection site
• Breast tenderness
• Bloating
• Nausea
• Headache
• Dizziness or sleepiness
• Mood changes

Contact a clinician promptly if you notice symptoms that could signal something more serious, such as:

• Signs of a severe allergic reaction (trouble breathing, facial swelling, hives)
• Chest pain, shortness of breath, sudden leg swelling, or calf pain (possible clot symptoms)
• Severe headache, vision changes, or weakness on one side
• Yellowing of skin or eyes (possible liver issue)
• Unusual or heavy vaginal bleeding that is not expected in your plan

Who should be cautious before using progesterone injections?

Your prescriber should know if you have a history of:

• Blood clots, stroke, or certain clotting disorders
• Liver disease
• Hormone-sensitive cancers (such as breast cancer) or a strong family history
• Unexplained vaginal bleeding
• Severe depression or mood disorders (progesterone can affect mood in some people)

If you are pregnant, trying to become pregnant, or in fertility treatment, follow your clinician’s guidance closely. Progesterone is sometimes used in pregnancy care, but the reason and timing should be medically directed.

Medication interactions

Some medications can change how hormones are processed. Tell your provider about everything you take, including supplements.

Examples that may matter include certain anti-seizure medicines, rifampin-like antibiotics, and herbal products such as St. John’s wort. Your clinician can check whether your regimen needs adjustment.

Available strengths (other dosage options)

Depending on what is stocked and prescribed, progesterone injections are often available in multiple strengths. Commonly seen options include:

• Susten 25 mg Injection (Progesterone)
• Susten 50 mg Injection (Progesterone)
• Susten 100 mg Injection (Progesterone)
• Susten 200 mg Injection (Progesterone)

Availability can vary, so confirm what your prescription specifies.

Substitute options already available in the market

If Susten is not available or your clinician prefers another option, substitutes may include:

• Progesterone Injection USP (generic progesterone injection) from various manufacturers
• Other branded progesterone injections (brand names vary by supplier and region)
• Susten 400 mg (Progesterone)
• Susten 8% Vaginal gel (Progesterone)
• Gestoford 200 mg (Progesterone)
• Gestone 200 mg (Progesterone)

In some treatment plans, clinicians may also consider progesterone in different forms, such as vaginal suppositories/gel or oral progesterone capsules. These are not direct “swap” products because absorption and blood levels can differ by route, so substitutions should be approved by your prescriber.

FAQs

1. What should I do if I miss a dose or miss an injection appointment?

Call your prescriber or fertility clinic as soon as you can. With progesterone, timing can be important, especially in assisted reproduction cycles. Do not double the next dose unless your clinician specifically instructs you to.

2. Can I drink alcohol while using progesterone injections?

It is best to ask your prescriber. Alcohol can worsen side effects like dizziness or sleepiness, and it may not fit well with fertility or hormone treatment goals.

3. How do I dispose of used needles and syringes?

Use an FDA-cleared sharps container if possible. If you do not have one, use a thick plastic container with a tight lid (like a detergent bottle) and follow local pharmacy or county disposal guidance. Do not throw loose needles into household trash.

4. Can I travel with Susten 100 mg Injection?

Usually, you can, but plan ahead. Keep the medication in its original packaging with the prescription label, and carry it with you instead of checking it. If temperature storage is specified on the label, use an insulated bag and ask a pharmacist what range you should maintain.

5. What should I check before using an injection vial or ampoule?

Verify the name, strength, and expiration date. Do not use it if the container is cracked, the solution looks unusual compared to what you were told to expect, or if you are unsure it was stored correctly. When in doubt, a pharmacist is the right person to ask.