What medication can induce menstruation immediately?
Every woman may experience delayed, postponed, or absent menstruation (amenorrhea), which can lead to severe endocrine imbalance, premature ovarian insufficiency, and—in severe cases—even premature menopause. This not only compromises a woman’s physical appearance and vitality but also impairs her fertility.

What Medication Can Induce Menstruation Immediately?
If menstruation is significantly delayed and comprehensive medical examinations reveal no underlying pathology, progesterone injections administered at a hospital are often effective—menstruation typically begins within several days of injection. This occurs because menstrual bleeding results from the shedding of the endometrium, which thickens under the influence of estrogen and progesterone and subsequently sloughs off in response to hormonal fluctuations. Women seeking to adjust their menstrual timing may use progesterone medications under physician supervision; withdrawal bleeding usually follows cessation of treatment. However, menstruation does not occur immediately upon starting the medication—it generally takes several days to manifest. Frequent or long-term use of hormonal agents is discouraged, as it may disrupt the body’s natural endocrine balance and exacerbate menstrual irregularities.

Knowledge Expansion: How to Regulate Menstruation
1. Dietary Adjustment
Consume a daily decoction made from red dates (jujubes) and longan fruit, eating all the cooked ingredients. This nourishes the blood while replenishing vital energy (Qi). For menstrual delay caused by general weakness or anemia, this regimen often restores menstruation within two to three days—and proves highly effective.
2. Avoid Cold Foods and Beverages
Some women habitually consume raw, cold foods—especially chilled beverages—which may induce “cold accumulation in the uterus” (a Traditional Chinese Medicine concept), leading to prolonged menstrual delay or even months-long amenorrhea. Such individuals should strictly avoid cold drinks, ice water, and other cooling foods. Instead, they should regularly drink ginger tea, soak their feet in warm water, and apply a hot-water bag to the lower abdomen. With consistent care over approximately two weeks, menstruation typically resumes naturally.

The above outlines options for inducing menstruation quickly. We hope this information proves helpful to you.