Progestins (either natural progesterone or synthetic progestogen) are used by women with irregular or skipped periods to restore regular cycles. Because of this, they may also help menstrual pain. They also reduce heavy bleeding and may protect against uterine and ovarian cancers.
http://www.nytimes.com/health/guides/symptoms/menstrual-periods-heavy-prolonged-or-irregular/medications.html
Other common causes of irregular periods include: 1  Having an intrauterine device (IUD) 2  Changing birth control pills or using certain medications. 3  Too much exercise.  Polycystic ovary syndrome 1  (PCOS) Pregnancy or breastfeeding. 2  Stress. Overactive thyroid (hyperthyroidism) or underactive thyroid (hypothyroidism)
http://www.webmd.com/women/guide/why-is-my-period-so-random
Hormone therapy (HT). An irregular menstrual cycle is often due to a lack of or imbalance in certain hormones in the body. Doctors often prescribe birth control pills (oral contraceptives) containing the hormones estrogen and progesterone to help control irregular periods.
http://www.webmd.com/women/guide/why-is-my-period-so-random
If you're not ovulating, you can't get pregnant. Irregular periods may be a sign of polycystic ovarian syndrome (PCOS). Depending on whether you ovulate on your own or not, you may be able to get pregnant by yourself with PCOS. How to Get Pregnant With PCOS.
https://www.verywell.com/how-to-get-pregnant-with-irregular-periods-1959933
There are several options you may want to try to reduce your heavy menstrual bleeding. Ice packs. Put an ice pack on your abdomen for 20 minutes at a time, several times a day when bleeding is especially heavy. Vitamins.Try vitamin C supplements to help your body absorb iron and possibly strengthen blood vessels.
http://www.healthywomen.org/content/article/heavy-menstrual-bleeding-symptoms-and-treatment
OCs are often used to regulate periods in women with menstrual disorders, including menorrhagia (heavy bleeding), dysmenorrhea (severe pain), and amenorrhea (absence of periods). Oral contraceptives are as effective for treating pain from endometriosis as the more potent gonadotropin releasing hormone agonists.
http://www.nytimes.com/health/guides/symptoms/menstrual-periods-heavy-prolonged-or-irregular/medications.html
This shedding may also cause irregular periods and light bleeding (“spotting”) between menstrual cycles. Eventually, the LNG-IUS results in a shorter period, with little or no blood flow. For many women, the LNG-IUS completely stops menstrual periods.
http://www.nytimes.com/health/guides/symptoms/menstrual-periods-heavy-prolonged-or-irregular/medications.html
An occasional irregular cycle is normal. Stress or illness can cause a delay in ovulation or menstruation, causing your cycle to be longer, and sometimes shorter, than usual. If you have just one or two off periods a year, don't worry.
https://www.verywell.com/how-to-get-pregnant-with-irregular-periods-1959933
Polycystic ovary syndrome (PCOS) and hypothyroidism are two common causes of irregular periods in women. In general, the goal of treatment is to restore the balance of hormones in the body. If you have PCOS, your doctor may recommend birth control pills or other hormones to trigger a period.
http://www.webmd.com/women/guide/why-is-my-period-so-random
Heavy Menstrual Bleeding: Symptoms and Treatment. Share on: Heavy menstrual bleeding (called menorrhagia by health care professionals) is defined as soaking a pad and/or tampon every hour or less during each menstrual cycle. For many women, heavy menstrual bleeding is a huge obstacle to their lifestyles.
http://www.healthywomen.org/content/article/heavy-menstrual-bleeding-symptoms-and-treatment
medications to help abnormal periods
Oral contraceptives to help control abnormal periods.