Logynon Side Effects: Complete Safety Guide

What Are the Common Side Effects of Logynon?

Based on the Patient Information Leaflet and clinical data, side effects are categorised by frequency. Most are mild and transient.

Common (affecting 1‑10% of users)

• Nausea, stomach ache
• Headaches (including migraines)
• Breast tenderness or pain
• Mood swings, depressive moods
• Weight gain
• Breakthrough bleeding or spotting – especially in the first few months
• Fluid retention
• Loss of interest in sex
• Skin rash or itching

Uncommon (0.1‑1%)

• Vomiting, diarrhoea
• Increase in appetite
• Hives (urticaria)
• Enlarged breasts

Rare (0.01‑0.1%) and serious side effects

• Venous thromboembolism (deep vein thrombosis, pulmonary embolism)
• Arterial thrombosis (stroke, heart attack, transient ischaemic attack)
• Breast cancer – slight increased risk
• Cervical cancer – possible increased risk
• Liver tumours (benign or malignant) – very rare
• Severe allergic reactions (angioedema: swelling of face/tongue, difficulty breathing)
• Chloasma (yellow‑brown patches on skin)
• Pancreatitis (if high triglycerides)
• Haemolytic uraemic syndrome (kidney failure, low platelets)
• Gallstones

For a complete list, consult the Logynon PIL.

When Do Logynon Side Effects Start?

The onset of side effects varies:

• Immediate (first few days): Nausea, headache, breast tenderness – these are often due to hormonal changes and may appear within the first week.
• First 1‑3 cycles: Breakthrough bleeding, mood changes, weight changes, and acne fluctuations typically become apparent during the first few packs as your body adjusts.
• Delayed (months to years): Serious risks like blood clots (highest in the first year), breast cancer (after prolonged use), and chloasma (after sun exposure) develop over longer periods.

Blood clots can occur at any time, but the risk is highest during the first year of use or when restarting after a break of 4+ weeks.

How Long Do Logynon Side Effects Last?

• Mild side effects (nausea, headache, breast tenderness): Usually resolve within 2‑3 months as your body acclimatises. If they persist beyond three cycles, consult your doctor; a different pill may suit you better.
• Breakthrough bleeding: Commonly settles after the first 3 packs. If it continues or starts after a period of regular cycles, further investigation may be needed.
• Mood changes: Some women experience improvement after a few months; for others, it may persist. If depressive symptoms develop, seek medical advice promptly.
• After stopping Logynon: Most hormone‑related side effects disappear within a few days to weeks. Fertility returns quickly, often in the first cycle.
• Serious events (clots, tumours): Require immediate discontinuation and medical management; recovery varies.

Logynon Side Effects Timeline

Contraindications: When Should You NOT Take Logynon?

Logynon is not suitable for everyone. Do not use if any of the following apply (adapted from PIL section 2):

• Blood clots: Current or past DVT, PE, or known clotting disorder (e.g., Factor V Leiden, protein C/S deficiency).
• Arterial disease: History of heart attack, stroke, angina, TIA.
• Migraine with aura (increases stroke risk).
• Severe or multiple risk factors for arterial disease: Diabetes with vascular complications, very high blood pressure, severe dyslipidaemia.
• Liver disease: Severe hepatic impairment, liver tumours, or active hepatitis (until liver function normalises).
• Breast cancer or other hormone‑sensitive cancer (current or past).
• Pregnancy or suspected pregnancy.
• Hypersensitivity to any ingredient.
• Concomitant use with certain hepatitis C medications (ombitasvir/paritaprevir/ritonavir, dasabuvir, glecaprevir/pibrentasvir, sofosbuvir/velpatasvir/voxilaprevir).

Also, if you are over 35 and smoke, or have a BMI ≥30, your doctor will assess whether the benefits outweigh risks. Discuss your full medical history.

Food Interactions with Logynon

There are no known significant food interactions that affect Logynon's efficacy or side effect profile. However:

• Grapefruit juice: May inhibit CYP3A4, potentially increasing oestrogen levels. While not listed in the PIL, it is prudent to avoid large quantities of grapefruit juice.
• Nausea reduction: Taking Logynon with food or at bedtime can help reduce nausea, a common early side effect.
• Alcohol: Moderate alcohol intake does not affect contraception, but binge drinking may increase the risk of vomiting (which can reduce pill absorption) and also increase thrombosis risk indirectly.

Always inform your doctor about any herbal supplements (e.g., St John's Wort, which reduces efficacy).

Logynon Side Effects FAQs

Need Advice on Logynon Side Effects?

If you are experiencing side effects or have concerns about Logynon, our UK‑registered doctors can offer guidance and discuss alternative contraceptive options.

Secure Consultation & Prescription

MHRA‑compliant | GPhC‑registered pharmacy | Discreet packaging | UK‑registered doctors