Medically reviewed by Dr. Shweta Agarwal, MBBS, DGO. Last updated: June 2026.
Information on this page is educational and does not replace a medical consultation. Outcomes depend on individual clinical factors.
Aansh Hospital & IVF Center is a government-registered Level-2 ART clinic (Reg. No. MH/AC/2024/15441/L2/Chandrapur/132) serving Vidarbha and northern Telangana from its headquarters in Chandrapur. Treatment is led by Dr. Shweta Agarwal (MBBS, DGO, Reproductive Medicine), with embryology (when required for IVF) led by Senior Clinical Embryologist Aayush Agarwal, Ph.D. Ovulation induction is often the appropriate first step for women with irregular cycles before considering more involved procedures — but it requires careful monitoring, which is available at our in-house facility. You can verify our ART registration on the National ART & Surrogacy Registry.
Who needs ovulation induction, and why?
Ovulation induction is appropriate when irregular or absent ovulation (known medically as oligo-ovulation or anovulation) is identified as a barrier to conception, or when timed egg release will improve the effectiveness of a concurrent procedure such as IUI. The most common situations where OI is recommended include:
- PCOS (polycystic ovary syndrome) — the most frequent cause of anovulation; women with PCOS often ovulate infrequently or not at all, and respond well to OI medication.
- Hypothalamic or functional anovulation — irregular cycles due to weight, stress, or hormonal disruption.
- Unexplained infertility — when all diagnostic tests return normal but conception has not occurred; OI may be combined with IUI as a first structured treatment step.
- Before IUI — stimulating the ovaries to produce one or two follicles and timing the trigger shot around the insemination procedure.
- Menstrual and cycle disorders — including irregular periods where ovulation timing cannot be predicted naturally.
OI is generally not the right approach when both fallopian tubes are blocked, when sperm parameters are severely abnormal, or when ovarian reserve (AMH) is very low — in those situations IVF is more appropriate. A fertility assessment will clarify which path is right for you.
What medications are used for ovulation induction?
Three classes of medication are used, each working differently and suited to different clinical situations. Your treating doctor will recommend one based on your diagnosis, hormone profile, and whether OI is combined with IUI.
Letrozole (aromatase inhibitor)
Letrozole is an aromatase inhibitor that works by temporarily lowering oestrogen levels, which signals the pituitary gland to release more FSH (follicle-stimulating hormone) and drive follicle development. It is increasingly used as a first-line oral medication for ovulation induction, particularly in PCOS. Major clinical trials have compared letrozole with clomiphene in women with PCOS and shown higher ovulation and live-birth rates with letrozole, showing a 27.5% live-birth rate compared to 19.1% for clomiphene (per the Legro et al. trial published in NEJM 2014). Letrozole is taken orally, typically on Days 2–6 or Days 3–7 of the cycle (per ASRM 2013), and has a relatively short half-life, meaning it clears the body before ovulation occurs.
Clomiphene citrate (Clomid)
Clomiphene is a selective oestrogen receptor modulator (SERM). It blocks oestrogen receptors in the hypothalamus, creating a false signal of low oestrogen and prompting the pituitary to secrete more FSH. Clomiphene has a long history of use in ovulation induction and is taken orally on Days 2–6 or Days 3–7 of the cycle (per ASRM 2013). One limitation is that clomiphene can have anti-oestrogenic effects on the cervical mucus and uterine lining in some women, which is why letrozole has become preferred in certain cases, especially PCOS. Clomiphene remains a reasonable option for many women with anovulation and is well studied.
Gonadotropins (injectable FSH/LH)
Gonadotropins are injectable hormones — FSH alone, or FSH combined with LH — that directly stimulate the ovarian follicles to develop. They are used when oral medications have not produced adequate follicle development, or when a more controlled response is needed. Because gonadotropins are more potent, they carry a higher risk of developing multiple follicles simultaneously, which raises the risk of multiple pregnancy and ovarian hyperstimulation syndrome (OHSS) — particularly in women with PCOS, who can respond strongly. For this reason, gonadotropins require more frequent monitoring (see below) and careful dose management. In Marathi/Hindi, gonadotropins are sometimes referred to in patient discussions as इंजेक्शन उपचार (injection treatment). They are generally reserved for selected cases where oral agents alone are insufficient.
What does an ovulation induction cycle look like, step by step?
Baseline assessment (Day 2–3): A transvaginal ultrasound confirms the ovaries are resting (no residual cyst from a prior cycle) and a baseline antral follicle count is obtained. Hormone blood tests (FSH, LH, oestradiol, AMH) are reviewed. This is also when medication type and dose are decided.
Medication (Days 2–6 or 3–7 typically): Oral letrozole or clomiphene is taken for five days. If gonadotropins are prescribed, daily injections begin around Day 2–3 and continue until the trigger.
Follicular monitoring ultrasound scans: Starting around Day 10–12, transvaginal ultrasound scans track the size and number of developing follicles. Blood oestradiol measurements may be added alongside ultrasound, particularly in gonadotropin cycles, to assess the hormonal response. Multiple scans (2–4 visits) may be needed until the leading follicle reaches the target size.
Trigger injection: When the leading follicle reaches approximately 18–20 mm in diameter — indicating readiness — a trigger injection of hCG (human chorionic gonadotropin) is given. This prompts final egg maturation and ovulation approximately 36–38 hours later.
Timed intercourse or IUI: Intercourse is timed around the expected ovulation window (typically 24–36 hours after the trigger). If the cycle is combined with IUI, insemination is scheduled approximately 36 hours after the trigger.
Luteal phase support: Some protocols add a short course of progesterone after ovulation to support the uterine lining, particularly if the cycle is combined with IUI.
Pregnancy test: A blood or urine test is performed approximately 14 days after ovulation/insemination.
What happens if a cycle produces too many follicles?
If monitoring scans show more than two or three mature follicles, the treating doctor will discuss the options with you:
- Conversion to IUI — if the cycle was planned as timed intercourse, switching to IUI can sometimes continue the cycle under controlled conditions.
- Cycle cancellation — if the risk of high-order multiple pregnancy (triplets or more) is unacceptable, the cycle is cancelled before the trigger injection. This is a safety measure, not a treatment failure.
- Dose adjustment in subsequent cycles — monitoring data from one cycle informs the medication dose for the next.
Cycle cancellation for over-response is most common with gonadotropins and in women with PCOS, who respond more strongly to stimulation. Close monitoring is what makes it safe.
What are the risks of ovulation induction?
Ovulation induction is generally well tolerated, but carries real risks that are important to understand before starting:
- Multiple pregnancy — if more than one follicle releases an egg and fertilisation occurs from each, a multiple pregnancy (twins, rarely more) can result. Multiple pregnancies carry higher risks for mother and babies: preterm birth, low birth weight, and obstetric complications. Monitoring and cycle cancellation are used to minimise this risk.
- Ovarian hyperstimulation syndrome (OHSS) — an exaggerated response to stimulation in which the ovaries become enlarged and fluid shifts out of blood vessels, causing abdominal bloating, discomfort, and in severe cases, serious complications. OHSS risk is higher with gonadotropins than with oral agents, and is particularly relevant in women with PCOS. Close monitoring allows the dose to be adjusted or the cycle cancelled before OHSS becomes severe.
- Mood changes and side effects — hot flushes, mild bloating, mood fluctuation, and pelvic discomfort are commonly reported with both clomiphene and letrozole. These are generally temporary and resolve after the medication course ends.
- No guaranteed ovulation — medication stimulates follicle development; it does not guarantee that ovulation or pregnancy will occur. Results vary by individual clinical factors.
When is ovulation induction not enough, and what comes next?
OI with timed intercourse is most useful when the main barrier is anovulation and the tubes are open, sperm parameters are adequate, and the uterine cavity is normal. If OI cycles do not result in pregnancy after a reasonable number of attempts — typically 3 to 6 cycles (per ASRM guidelines) — the next steps are typically:
- IUI combined with ovulation induction — placing washed sperm directly into the uterus at the time of induced ovulation reduces the distance sperm must travel and is effective for mild male-factor or unexplained infertility.
- IVF — if IUI has not succeeded, or if a more severe factor is identified (blocked tubes, significant male factor, low ovarian reserve), IVF gives more complete control over fertilisation and embryo development.
The decision on when to step up depends on age, diagnosis, ovarian reserve, sperm parameters, and how many treatment cycles have been completed — Dr. Shweta Agarwal will review your specific situation at each stage. See IVF vs IUI — how we decide which is right for more context.
How many monitoring scans are needed during an OI cycle?
The number of transvaginal ultrasound scans during a cycle depends on the medication used and your ovarian response. Oral agent cycles (letrozole or clomiphene) typically require two to three scans — a baseline scan around Day 2–3 and follicle-tracking scans from around Day 10 until the trigger. Gonadotropin cycles require more frequent monitoring — often three to four or more visits — because the response can change quickly and dose adjustments need to be made in real time. Blood oestradiol levels may also be measured alongside scans in gonadotropin cycles. All monitoring is done in-house at our Chandrapur facility, with Vidarbha and northern Telangana patients able to attend at our regional centers.
What does ovulation induction cost?
Cost depends on the medication used (oral agents are less expensive than injectables), the number of monitoring scans required, and whether OI is combined with IUI. Final cost depends on individual clinical evaluation — see Costs & EMI for current pricing.
- 0% EMI options are available — see cost & 0% EMI.
- A written cost estimate is provided before the cycle begins.