**Question:** MC side effect of DMPA is:-

A. Increased risk of osteoporosis
B. Increased risk of deep vein thrombosis
C. Increased risk of breast cancer
D. Increased risk of liver cancer

**Core Concept:** DMPA (Depot Medroxyprogesterone Acetate) is a progestin contraceptive hormone, commonly used for birth control and fertility regulation. Side effects are consequences or alterations caused by the use of DMPA.

**Why the Correct Answer is Right:**

The correct answer, B. Increased risk of deep vein thrombosis, refers to a blood clot that forms in a deep vein, typically in the legs (deep vein thrombosis, DVT). Progestins like DMPA can potentially increase blood clotting tendency due to their effects on blood coagulation processes and fibrinolysis (the process of breaking down blood clots). This makes the user more prone to develop a blood clot, especially in the context of immobility, such as during long flights or periods of bed rest.

**Why Each Wrong Option is Incorrect:**

A. Increased risk of osteoporosis (Option A) is incorrect because progestins, including DMPA, are generally considered to have a neutral or protective effect on bone mass due to their anti-estrogenic properties.

C. Increased risk of breast cancer (Option C) is incorrect as current evidence suggests that progestins like DMPA do not significantly increase the risk of breast cancer when used for contraception. In fact, some studies suggest that long-term use of progestins might reduce the risk of breast cancer.

D. Increased risk of liver cancer (Option D) is incorrect. Current evidence indicates that DMPA does not significantly increase the risk of liver cancer, a finding supported by systematic reviews and large-scale studies.

**Clinical Pearls:**

1. Side effects of DMPA should be discussed to patients considering its use as a contraceptive or fertility regulator.
2. However, considering the potential risks and benefits, individual patients should be counselled based on their specific circumstances and risk factors.
3. Regular monitoring for potential side effects such as DVT and breast tenderness is recommended for users of DMPA.
4. Progestins, including DMPA, are generally considered safe for most patients. However, careful consideration is necessary for high-risk individuals (e.g., smokers, those with a family history of DVT, or those with other risk factors for DVT).