Can I take Oestrogel pump-pack and Vitamin B2 together?
Drug interaction guide
Originally published 25 Jan 2026
Meets Patient’s editorial guidelines
- DownloadDownload
- Share
- Language
- Discussion
- Audio Version
- Add to preferred sources on Google
There is no known interaction between Oestrogel (estradiol) and Vitamin B2 (riboflavin). It is generally safe to use these two products together.
Why this happens
Oestrogel is a hormone replacement therapy (HRT) absorbed through the skin into the bloodstream. Vitamin B2 is a water-soluble vitamin absorbed through the digestive tract. They are processed by different pathways in the body and do not interfere with each other's effectiveness or safety.
What you should do
You can continue to take Vitamin B2 while using Oestrogel as prescribed. No special precautions or timing adjustments are necessary.
Important precautions
Blood clots and breast cancer
You must not use Oestrogel if you have ever had breast cancer, or if you have ever had a blood clot in a vein (thrombosis) or the lungs (pulmonary embolism).
Oestrogel slightly increases your risk of blood clots (DVT/PE), stroke, and breast cancer. Seek immediate medical help if you experience sudden chest pain, breathlessness, or painful swelling in one leg.
Unexplained vaginal bleeding
Do not use Oestrogel if you have any vaginal bleeding that has not been checked and explained by your doctor.
Skin contact transfer
Do not allow other people, especially children, to come into contact with the area of skin where you applied the Oestrogel. Cover the area with clothing once dry to prevent accidental hormone transfer.
Food and drink warnings
Alcohol
It is best to avoid or strictly limit alcohol while using Oestrogel. Drinking alcohol can increase the levels of oestrogen in your blood, which may increase the risk of side effects. Additionally, long-term alcohol consumption combined with Hormone Replacement Therapy (HRT) is linked to a higher risk of breast cancer.
It is best to avoid or strictly limit alcohol when taking Vitamin B2. Alcohol can interfere with the way your body absorbs this vitamin from the digestive tract, making the supplement less effective.
Grapefruit juice
Grapefruit juice can interfere with how your body breaks down estradiol. This can lead to higher levels of the medicine in your bloodstream, potentially increasing the risk of side effects such as breast tenderness, nausea, or headaches.
Using other medicines
Taking multiple medicines? Our Medicines Interaction Checker helps you check whether your prescriptions, over-the-counter medicines, and supplements are safe to take together. Simply search for your medicines to see potential interactions and what to do about them.
Disclaimer
This information is for general educational purposes only and should not be relied upon as a substitute for professional medical advice. Always consult your GP, pharmacist, or another qualified healthcare professional before making decisions about your medications. Individual circumstances may vary, and only a healthcare professional who knows your medical history can provide personalised guidance.
Patient picks for Drug interactions

Drug interactions checker
Can I take Warfarin and Aspirin together?
Taking warfarin and aspirin together significantly increases your risk of serious bleeding. This includes internal bleeding, such as in the stomach or brain, as well as bleeding that is hard to stop from minor cuts or injuries.

Drug interactions checker
Can I take Allopurinol and Nortriptyline together?
There is no known direct interaction between allopurinol and nortriptyline. However, both medications can occasionally cause side effects that affect the liver or blood counts. Taking them together does not typically increase these risks, but it is important to be aware of how you feel.
Article history
The information on this page is written and peer reviewed by qualified clinicians.
Article also available in English, German, Spanish, French, Italian, Portuguese, Hindi, Hebrew, Arabic, and Swedish.
25 Jan 2026 | Originally published
Join the conversation
Share your thoughts or experiences with others in our patient communities.

Ask, share, connect.
Browse discussions, ask questions, and share experiences across hundreds of health topics.

Feeling unwell?
Assess your symptoms online for free
Sign up to the Patient newsletter
Your weekly dose of clear, trustworthy health advice - written to help you feel informed, confident and in control.
By subscribing you accept our Privacy Policy. You can unsubscribe at any time. We never sell your data.
More in drug interactions checker
- Can I take Alogliptin and Amlodipine together?
- Can I take Alogliptin and Losartan together?
- Can I take Amitriptyline and Tizanidine together?
- Can I take Amlodipine and Fibre supplements together?
- Can I take Amlodipine and Naproxen together?
- Can I take Anastrozole and Omeprazole together?
- Can I take antihistamines while pregnant?
- Can I take Aspirin and Naproxen together?
- Can I take Atorvastatin and Spironolactone together?
- Can I take Black cohosh and St John's wort together?
- Can I take Co-codamol and Lipitor together?
- Can I take Flecainide and Rivaroxaban together?
- Can I take Gabapentin and Omeprazole together?
- Can I take Glibenclamide and Empagliflozin together?
- Can I take Glucomannan and Nexplanon together?
- Can I take Ibuprofen and Pregabalin together?
- Can I take Naproxen and Sertraline together?
- Can I take Oxycodone and Pregabalin together?
- Can I take Sertraline and Alcohol together?
- Can I take Venlafaxine and Sildenafil together?