Use Sronyx birth control pills to reduce your chances of pregnancy

Sronyx is a low-estrogen pill that works well and comes with both active pills and placebos in every pack.

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20mcg/0.1mg84 tablets$90.00In Stock
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Reviewed by Dr Yasmin Aghajan, MD

Information last reviewed 07/07/19


What is Sronyx?

Sronyx is a birth control pill that contains both estrogen and progesterone, but there is a lower dose of estrogen than in standard combined contraceptives. This can help to reduce side effects associated with estrogen such as headaches, nausea and breast tenderness. Each pack of Sronyx contains the active pills, which are white in colour, and some peach pills that are inactive placebo pills. The placebo pills have no effect upon your body, but they are included to help you remember when to take your pills again after your period. 

How does Sronyx work?

Sronyx contains synthetic versions of both estrogen and progesterone. The progesterone helps to prevent pregnancy by preventing the ovaries from releasing an egg (ovulation) and by causing a thickening of the mucus around the vagina and cervix. This helps to stop sperm from reaching an egg to fertilize it. The estrogen further helps to prevent pregnancy, by stopping a fertilized egg from implanting itself in the lining of the womb/uterus (endometrium). 

How effective is Sronyx?

When taken correctly, Sronyx is 99% effective in preventing pregnancy. A more accurate success rate, which takes into account women who occasionally forget to their pill, is around 97%. Sronyx will NOT protect you from STIs, nor will any other form or hormonal contraceptive. The only contraception to offer partial protection from STIs is condoms.


Active ingredients

Sronyx contains active white pills and inactive placebo pills which are peach-colored. The placebo pills do not contain any active ingredients. They are included as a way to help you remember when to start taking your pills again after your period. 

The active ingredients in Sronyx are: 20mcg ethinyl estradiol (EE) and 0.1mg levonorgestrel. 

Inactive ingredients

The inactive ingredients in the white Sronyx pills are: croscarmellose sodium, lactose monohydrate, magnesium stearate, povidone and microcrystalline cellulose.

The inactive ingredients in the peach Sronyx placebo pills are: FD & C Yellow No. 6, anhydrous lactose, magnesium stearate, microcrystalline cellulose and lactose monohydrate. 

Which ingredients can cause an allergic reaction?

It is very rare to be allergic to the active ingredients, estradiol and levonorgestrel. However, some who have a severe allergy to lactose might experience some undesirable side effects as these pills contain lactose as an inactive ingredient. 


Sronyx dosage

The usual dosage of Sronyx is 1 x active tablet containing 20 mcg ethinyl estradiol and 0.1 mg levonorgestrel, taken once daily for the first 21 days, then 1 placebo tablet each day for the next 7 days.

How to start Sronyx

Before starting Sronyx, read the packet instructions carefully, and never start taking it without first consulting a doctor. Sronyx comes in the form of 28-day blister packs marked with the days of the week, containing 21 white active tablets (containing the active hormones) and 7 peach-colored inactive tablets, which simply help you to keep track of your cycle. You have 2 options of how to start Sronyx:

  • Day 1 Start: Take your first white active tablet on the first day of your period (day 1 of your menstrual cycle). Make sure to take the first tablet marked with the correct day of the week.
  • Sunday Start: Start by taking the first pill in the pack, marked as ‘Sunday’, on the first Sunday after your period starts, even if you are still bleeding. If you choose this method, you will need to make sure you use an alternative method of contraception, such as condoms, for the first 7 days after beginning Sronyx.

How to take Sronyx

Take 1 pill per day, at the same time each day. To help you remember, try and make this a part of your daily routine: for example, take your pill each morning when you brush your teeth. When you finish the 21 active pills in a pack, move onto the inactive pills the next day. During these 7 days, you will experience a withdrawal bleed; this is a simulation of a natural period, but will not necessarily last for 7 days. Make sure you take all 7 inactive pills even if you have stopped bleeding, and then move onto a new pack the next day without taking a break. Always have a new pack ready.

What do I do if I forget to take my pill?

If you have missed taking an active pill, try to take it as soon as possible and then continue as normal with the remaining pills. In case you miss 2 of the active pills, take 2 as soon as you remember and another 2 the following day. Take the remaining pills as normal. If you have missed 2 or more pills, it’s best to use additional non-hormonal contraceptive methods such as condoms for at least 7 days. This minimizes the risk of unwanted pregnancy because missing multiple pills can lower the effectiveness of Sronyx. If you forget to take one of the inactive pills, just dispose of the missed pill and continue with the next one the following day. It can be normal to experience breakthrough bleeding when you have missed active pills. Speak to your doctor if you are not sure what to do after forgetting to take a pill.

Side Effects

Sronyx side effects

Sronyx may produce various side effects including the following:

  • Irregular vaginal bleeding, breakthrough bleeding (bleeding between your periods), spotting.

  • Swelling - particularly in your ankles or feet

  • Melasma (a darkening of the skin, especially around the face)

  • Difficulty wearing contact lenses

Other side effects are possible, so you should always read the patient information leaflet before taking any medication. It is important that you re-read the leaflet, whenever you start a new pack, to ensure that you are always up-to-date and aware of any issues you may experience.


If you experience any severe side effects, including symptoms of an allergic reaction (difficulty breathing; swelling of tongue, mouth, lips, throat; hives) you should seek emergency medical attention.


Do NOT take Sronyx if:

  • You are or think you are pregnant, or plan to become pregnant
  • You previously had a heart attack or a stroke
  • You have thrombophlebitis (blood clots in the legs) or pulmonary embolism (blood clots in the lung)
  • You have blood clots in the brain (stroke) or eyes
  • You previously had blood clots in the deep veins of your legs
  • You have chest pain (angina pectoris)
  • You have or suspect to have breast cancer or cancer of the uterus lining, cervix or vagina
  • You experience unexplained vaginal bleeding
  • You have had jaundice (yellowing of the skin or whites of the eyes) during pregnancy or whilst using another contraceptive pill
  • You have a liver tumor (benign or cancerous)


If you have any of the following, please talk to your doctor before taking Sronyx:

  • You have breast nodules, an abnormal breast x-ray or mammogram or fibrocystic breast conditions
  • You have diabetes
  • You have high levels of cholesterol or triglycerides
  • You have high blood pressure
  • You have migraines or other headaches
  • You have epilepsy
  • You have depression
  • You have gallbladder, heart or kidney disease
  • You have a history of irregular menstrual periods
  • You smoke. It is best not to smoke whilst taking hormonal contraceptives.

Drug interactions

Before you take Sronyx, speak to your doctor if you take other medications (purchased with or without a prescription). The following medications could interfere with the effectiveness of Sronyx:

  • Rifampin
  • Barbiturates, phenylbutazone, phenytoin sodium
  • Griseofulvin, ampicillin and tetracyclines
  • HCV combination therapy
  • Drug combinations containing ombitasvir/paritaprevir/ritonavir with or without dasabuvir

Treatment Options

Alternatives to Sronyx

There are many different types of hormonal contraception and women often have to try a few before finding the one that is right for them. Different pills contain different forms of progesterone and/or estrogen, and you may find that you are more sensitive to some ingredients than others. Sronyx, Lessina and Low Ogestrel have the advantage of containing a lower dose of estrogen and are therefore suitable for women who are particularly sensitive to estrogen. Alternatively, the progesterone-only pill, also known as the ‘mini pill’, does not contain any estrogen. This pill does not allow a break for a monthly bleed and, in some cases, can also be taken by women who are breastfeeding. 
If you do not wish to take a pill each day, you can try a form of hormonal contraception that is not taken orally. These include the implant (Implanon, Nexplanon), the shot (Depo-Provera), and the intrauterine device (IUD, Mirena, ParaGard, Skyla, Liletta, Kyleena). The IUD, in particular, is suitable for women with other health conditions, such as diabetes or hypertension, because it works locally on the reproductive system. For advice on finding the right contraceptive for you, speak to your doctor or health worker.

If you prefer to use non-hormonal methods of contraception, your options include barrier methods. These include the cervical cap (FemCap) and male and female condoms. Male condoms are the only form of contraception to offer protection against STIs.  


Disclaimer: This is not medical advice. You and your physician will determine if and how you should take any medication prescribed to you following a medical consultation.

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