Medicines & Supplements A to Z > Yaz


Last updated on 19/10/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Drospirenone + Ethinylestradiol


DRUG CLASS: Contraceptives

SUB CLASS: Progestins, Oestrogens

USED FOR: Contraception

AVAILABLE DOSAGE FORMS: 3mg/20 mcg (tablets)

What is Yaz for?

Yaz is a brand of oral contraceptives which contains two hormones: Drospirenone and Ethinylestradiol, which mimics the natural female hormones in the body. Yaz disrupts the normal menstrual cycle, and prevents ovulation, maturation of an egg and promotes detachment of fertilized eggs in the uterus lining. Apart from contraception, Yaz is also indicated for the treatment of acne vulgaris and premenstrual dysphoric disorder (if the patient desires an oral contraceptive for birth control).

How to use it?

Yaz is taken orally as tablets. Take the first tablet on day 1 of the menstrual cycle or first Sunday after onset of menstruation. Take one pink pill daily for 24 consecutive days, followed by one hormone-free white pill daily on days 25 through 28. Withdrawal bleeding will begin when taking the white tablets.

What are the side effects of Yaz?

Common side effects of Yaz include gastrointestinal discomfort, headache, menstrual cycle irregularities, stomach cramps, mood swings, nervousness, painful/tender breast, and drowsiness.

Who should not take Yaz?

People who are allergic to ethinylestradiol, drospirenone or any other component of the formulation.
– Patients with active or a history of thromboembolic disorders, such as deep vein thrombosis and pulmonary embolism.
– Patients with active or recent arterial diseases, such as angina, myocardial infarction or cerebrovascular disease.
– Women with undiagnosed vaginal bleeding.
– Patients with breast cancer and people with a past history of breast cancer.
Pregnant women.

Pharmacist Tips:

– Inform your doctor or pharmacist if you experience vaginal bleeding, severe mood changes, depression or symptoms of water retention, such as oedema.
– Yaz is not indicated during pregnancy. If pregnancy occurs during treatment with Yaz, stop further intake.
– Yaz should not be considered effective as a contraceptive until after the first 7 consecutive days of product administration.
– Avoid smoking use while taking this medication.
– Oral contraceptives are an effective method of birth control, however they do not prevent the transmission of HIV/AIDS and other sexually transmitted diseases.

Common dosing schedule:
Yaz should be taken at the same time each day, preferably either after the evening meal or at bedtime.

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Yaz may interact with:
St. John’s wort
– Hepatitis C drugs, e.g. Ombitasvir, Paritaprevir, Ritonavir
– Anticonvulsants, e.g. Phenobarbital, Phenytoin, Carbamazepine
– Nonsteroidal-antiinflammatory drugs, e.g. Ibuprofen, Naproxen

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Yaz in Hong Kong?

In Hong Kong, Yaz is an over-the-counter medicine and can be purchased without a prescription from any retail outlet in Hong Kong. This includes grocery stores, convenience stores, medicine shops, and pharmacies. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Yaz in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.