Skip to main content
Submitted by PatientsEngage on 11 February 2015
Image shows a woman looking at a strip of medicines

Dr Shital Patel answers all that you want to know about oral contraceptives, how they work, when you should use them, side effects, do they increase the risk of cancer?

What are Oral Contraceptives?

Oral contraceptives are hormonal preparations that may contain progesterone or combination of oestrogen and progestin. The combination drug prevents pregnancy by inhibiting the release of the hormones - luteinizing hormone (LH) and follicle stimulating hormone (FSH) from the pituitary gland in the brain. LH and FSH are important in the production of the egg and preparing the uterus lining for implantation of the embryo. 

Progestin hinders the sperm from penetrating and, therefore, fertilising the egg.

There are three types of combination pills available:

1. Monophasic birth control pills deliver the same amount of oestrogen and progestin every day.

2. Biphasic birth control pills deliver the same amount of oestrogen every day for the first 21 days of the cycle. During the first half of the cycle, the progestin/estrogen ratio is lower to allow the lining of the uterus (endometrium) to thicken as it normally does during the menstrual cycle. During the second half of the cycle, the progestin/estrogen ratio is higher to allow the normal shedding of the lining of the uterus to occur.

3. Triphasic birth control pills have constant or changing oestrogen concentrations and varying progestin concentrations throughout the cycle. There is no evidence that bi- or triphasic oral contraceptives are safer or superior to monophasic oral contraceptives, or vice versa, in their effectiveness for the prevention of pregnancy. 

How and when to take the pills?

Usually, birth control pills are packaged either as 21 or 28 day units. In the 21-day package, a pill is to be taken daily for 21 days followed by a 7 day gap. For the 28-day units, the pill is taken for 21 days, followed by a 7 day period during which a placebo pill(containing no medication) is taken. Newer formulations are now available with 24 (hormone) + 4 (placebo) pills, continuous or extended regimens, in which only the active hormone pill is taken. 

For the first seven days of starting the pill, additional contraception must be used because pregnancy may occur during this period [Just to be extra safe and give the pill time to kick in.] Failure to take the pill can result in pregnancy!  If a pill is forgotten, it should be taken as soon as possible. If more than one pill has been missed, instructions on the packaging should be followed or your local doctor should be consulted. 

Can birth control pills be used to delay a period?

Yes, birth control pills can be used to reduce or eliminate a period. If you are on the 21 day pack, simply skipping the placebo pills and starting right away on a new pack will omit your periods. There are several birth control pill regimens that prevent bleeding for three months or an entire year. This works best when taking a monophasic pill where the same hormone dose is taken.

How soon after stopping the birth control pill can one conceive?

Once the pill is stopped, periods should return in 4-6 weeks time and ovulation will resume. One can get pregnant at anytime after that.

What if periods don’t resume after stopping the pill?

When periods don’t resume for several months after the pills have stopped, you may have a condition called Post-pill Amenorrhea. In some women, the menstrual cycle fails to regulate after the birth control has stopped. Your gynecologist must be informed of this immediately.

Can I take a pregnancy test while being on the pill?

Pregnancy tests are designed to test a hormone called human chorionic gonadotropin (HCG), which is produced by the uterus after implantation. The birth control pills do not affect the level of HCG and hence you can get accurate results from a pregnancy test while you're on the pill. 

What are the effects of taking the pill accidently while being pregnant?

This is a very common accident and rarely does it harm the baby. However, once the pregnancy has been detected, the pills must be stopped immediately.

What are emergency contraception pills?

Emergency Contraception pills are used when a woman has had unprotected sex. This pill is commonly called the "morning-after pill”.  This pill should be taken within 72 hours of having sex and is more effective when taken within the first 24 hours. It contains levonorgestrel and is available over-the-counter at drugstores, as well as health clinics and Planned Parenthood. (Levonorgestrel works by delaying or preventing ovulation and even stopping the sperm from fertilizing the egg.) Brand names include Plan B One-Step, Next Choice to name a few. Ulipristal acetate (Ella) also is approved for emergency contraception but is only available by prescription.

Related reading: Frequently Asked Questions on Emergency Contraception Pills 

Can you stop birth control pills at any time or do you have to finish the current packet?

Yes the pill can be stopped at any time. It’s always best to inform your OBGYN and discuss other forms of birth control once the pill has stopped.

Can you get pregnant during the week that you take the placebo pills?

If the pills are taken regularly, the placebo does not increase chances of pregnancy. Birth control pills are considered 99% effective in preventing pregnancies. If a pill has been missed, the risk increases. Hence a condom should be used as back-up contraception.

Do birth control pills increase the risk of cancer?

Oral contraceptives are known to reduce the risk of ovarian and endometrial cancer. This protective effect increases with prolonged use of oral contraceptives pills. Birth control pills are associated with an increased risk of cervical cancer. This may be largely due to the fact that sexually active women have a higher chance of becoming infected with human papillomavirus (HPV), which causes virtually all cervical cancers.

According to the National Cancer Institute, the risk of breast cancer, especially among younger women does increase a little with the use of oral contraceptives. We are not sure by what percentage it raises risk. This risk, however, returns to normal 10 or more years after discontinuing use.

Research Update Jan 2018 on the increase in risk of breast cancer due to hormonal birth control pills:

Experts point out that the overall risk was miniscule with only 1 extra case of breast cancer among 7,700 women using such contraceptives per year.  There is good data to show that five or more years of oral contraceptive use substantially reduces ovarian cancer and endometrial cancer risk. So women should evaluate the results against the benefits of the pill for other cancers. 

There is also an increased risk of getting benign liver tumours, but the relationship between oral contraceptive use and malignant liver tumors is less clear.

Do birth control pills affect cholesterol levels?

There are different kinds of birth control pills that affect cholesterol. Some are combination pills, with oestrogen and progestin, while others are "mini-pills" with just progestin. Oestrogen may affect triglyceride levels and total cholesterol levels causing HDL (the "good" cholesterol) to increase and the LDL ("bad" cholesterol) to decrease. 

Progestin does the opposite and causes decrease in HDL and an increase in LDL. 

However, these changes in blood levels are not strong enough to have any significant effect.

Do birth control pills affect blood pressure?

Birth control pills may slightly increase blood pressure. This risk is higher in women who smoke, are overweight and have a family history of heart diseases. Doctors do regularly check blood pressure in all women on pills. If you already have high blood pressure, your doctor will discuss other forms of birth control.

Can women above 35 years of age continue taking birth control pills?

Oral contraceptives are usually not recommended to women above 35, because of increasing risk of developing heart disease. Birth control pills may slightly affect cholesterol levels, raise blood pressure, worsen glucose tolerance and increase the risk of rare blood clots. If a woman has any heart disease risk factors, the pill is not recommended after 35, but if a woman is healthy, new studies show that it is okay to continue the pill till early 50s. The final call lies with the doctor and patient and continued monitoring of the cardiovascular system.

Can antibiotics interfere with the birth control pills?

Antibiotics usually do not affect birth control pills and their actions except for Rifampin. Studies clearly show that Rifampin decreases the effectiveness of birth control pills in preventing ovulation. However, Rifampin is not commonly prescribed today.

What are the side- effects of oral contraceptive pills?

Most side-effects are only temporary and subside in a few months. Most common side effects include headache, breast tenderness, nausea, weight gain, irregular bleeding, and mood swings. 

There may be an increase in migraine frequency especially in women with a history of migraines. Conversely, women whose migraines are triggered by hormone fluctuations may notice improvement in their migraines.

Unusually, oral contraceptives may contribute to increased blood pressure, blood clots, heart attack and stroke. Women who smoke, are over the age of 35, and have a history of blood clots or breast or endometrial cancer, are advised against taking oral contraceptives, as these conditions can increase the adverse risks of taking oral contraceptives.

 

Stories

  • Image: A woman's left arm is visible, attached to a diagnostic machine in a hospital setting
    I Cried Bitterly The Day I Lost My Hair
    Dora Mukherjee went through the entire battery of tests and procedures after being detected with a Right Breast Carcinoma. She recalls her pain and anguish as well as the love she received during the critical period. The beginning with a diagnosis My painful journey with cancer started on 1st February 2014 when I was referred by my Bank's Medical Officer to Dr Gandhi's Imaging Clinic for Bilateral Mammography in Mumbai. Sonomammography was done which revealed a case of carcinoma…
  • A woman in a grey top and red pant clutching her stomach in pain
    Endometriosis And The Risk of Normalising Menstrual Pain
    Menstual pain or period pain is often considered normal, even when it is severe. This Menstrual Hygiene Day, PatientsEngage highlights the misdiagnosis of endometriosis and what women can do to detect the condition in its early phases. Women all over the world, have experienced menstrual pain at some point of their monthly cycles. Menstrual pain, usually begins a couple of days before the period date, and sometimes continues for two days after it. Women generally experience cramps in their…
  • Alina Rizvi (on the left) with her mother and ovarian cancer patient Rabab Rizvi
    Ovarian Cancer - Journey Through The Lens Of A Mother-Daughter Duo
    This mother-daughter interview takes us through a journey of a patient and caregiver, facing the turmoil of ovarian cancer diagnosis and treatment. Alina Rizvi is a resident of New Delhi, who has been taking care of her mother, Rabab Rizvi, a cancer patient for the last three years. Their journey has been tough, but a source of inspiration, affection and sheer joy that a mother-daughter relationship constitutes. Please tell us a bit about your condition  Daughter - My mother was diagnosed…
  • Stock Image of a woman in black with the reproductive parts superimposed in red
    Risk Factors For Ovarian Cancer And New Treatment Options
    Dr Pallavi Vasal, a Consultant Obstetrics and Gynecology at W Pratiksha Hospital, Gurgaon answers comprehensively to a wide range of questions on Ovarian Cancer - signs, screenings and risks, specifically with endometriosis, cysts and breast cancer.  #AskTheDoctor Series. 1.   Ovarian Cancer does not exhibit easy to spot signs and symptoms. So what should women watch out for? Most women have very few symptoms but you may experience one or more of the following: Lower abdominal…
  • Is Scar-less surgery a safe alternative for Breast reconstruction?
    An interview on a wide range of issues - from survival rates of breast cancer to quality of life, from the use of chemotherapy to breast reconstruction - with Dr. Vinay Deshmane, Consultant in Surgical Oncology & Breast Diseases and Medical Director and Jnt. Hon secretary of the Indian Cancer Society  1.    Has the survival rate of Breast Cancer changed in India in recent years? Why is that? There is paucity of data on survival rates of most cancers including Breast…
  • Image: Suparna, caregiver of mother with cancer in a scenic setting
    Journey As A Single Caregiver To My Mother with Cancer
    Suparna Mazumder has been a single caregiver for her mother who was diagnosed with metaplastic carcinoma of the ducts. She recounts her journey  – as an organizer of treatment, as a physical and mental care giver, as the only earning member of the family, as a single parent with a child The Diagnosis It all started in January 2004. 17th January, 11pm. While I was reading the newspaper, my domestic help told me that my mother had been feeling her breasts in the afternoon and had said…
  • Image of a person undergoing radiation therapy
    What Are The Side Effects Of Radiation Therapy?
    And other questions on types of radiation therapy and tips to handle the effects of radiation therapy answered by Dr. Arpana Shukla, Senior Consultant Radiation Oncology, Sterling Cancer Center Ahmedabad 1.   What exactly is Radiation Therapy? Radiation Therapy is a clinical modality mainly dealing with the use of ionizing radiations for the treatment of cancer patients (and occasionally benign diseases). The primary goal is to deliver a precisely measured dose of radiation to a…
  • The Best Tips Come From Cancer Patients and Survivors
    The Best Tips Come From People Who Have Beaten Cancer
    This World Cancer Day, cancer survivors and PatientsEngage contributors share advice based on their lives experience on how best to deal with a cancer diagnosis. #WeCanICan #WorldCancerDay #WCD2018 What would you tell a person who just learned of their cancer diagnosis?’ 1. Dilip Kumar Mevada, Multiple myeloma survivor Cancer so what? You can overcome it. You have to accept and forgive that you have cancer.  If I can survive you can also survive. We are the luckiest human beings to have…
  • Breast Self Examination (BSE) is a good tool for early detection for Breast Cancer
    Learn the right method for Breast Self Examination (BSE)
    says Dr Geeta Kadayaprath, a Surgical Oncologist and Head of Breast Surgery at Max Super Speciality Hospital, New Delhi. She strongly recommends Breast Self Examination (BSE) as one of the methods for early detection. How do you spread awareness about breast cancer? Through lectures, videos and street plays mainly 1.   Would you say the awareness has improved over the years? It has, but in select pockets only, mainly urban. There is no comprehensive, concerted method of creating…
  • Image shows a strip of pills meant to be contraceptive pills
    Research Update: Do Contraceptive Pills Increase the Risk of Breast Cancer?
    One of the largest studies on women (1.8 million women) tracked the effect of the use of hormonal birth control pills on risk of breast cancer. Read on to know the findings:  The study: Recently, the New England Journal of Medicine published a research conducted by a team of scientists in Denmark. They studied 1.8 million women between the ages of 15 and 49 over a stretch of approximately 11 years. They were looking for women who used hormonal birth control — usually a combination of…