Can I take Doxadura and Garlic supplements 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
Taking garlic supplements alongside Doxadura (doxazosin) may cause your blood pressure to drop lower than intended. This can lead to symptoms such as feeling dizzy, lightheaded, or faint, especially when you stand up quickly from a sitting or lying position.
Why this happens
Doxadura is an alpha-blocker used to lower blood pressure and treat prostate issues. Garlic supplements have natural blood-pressure-lowering properties. When used together, their effects can add up (an additive effect), causing an excessive drop in blood pressure.
What you should do
Use caution when combining these two. If you decide to take garlic supplements, monitor your blood pressure regularly. Be careful when standing up quickly. If you feel very dizzy or faint, stop the supplement and speak to your GP or pharmacist. It is best to inform your doctor before starting any new herbal supplements while on blood pressure medication.
Important precautions
First-dose hypotension
Doxadura can cause a sudden drop in blood pressure, especially after the very first dose. This may make you feel dizzy or faint when standing up. It is recommended to take your first dose at bedtime to avoid falls.
Surgery
Both garlic supplements and Doxadura can increase the risk of bleeding or affect blood pressure during surgery. You must stop taking garlic supplements at least two weeks before any planned surgical or dental procedure.
Cataract surgery
If you are due to have eye surgery for cataracts, you must tell your surgeon you are taking Doxadura. It can cause a complication called 'Floppy Iris Syndrome' which the surgeon needs to prepare for.
Food and drink warnings
Alcohol
It is best to avoid or strictly limit alcohol while taking Doxadura. Alcohol can increase the blood-pressure-lowering effect of this medicine, which may make you feel dizzy, lightheaded, or faint, especially when standing up.
It is best to avoid or strictly limit alcohol when taking garlic supplements. Both garlic and alcohol can have blood-thinning effects; combining them may increase your risk of bruising or bleeding. Additionally, alcohol can irritate the stomach lining, which may worsen the digestive side effects sometimes caused by garlic.
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 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.

Drug interactions checker
Can I take Ashwagandha and Vitamin B12 together?
There are no known clinical interactions between ashwagandha and vitamin B12. It is generally considered safe to take these two supplements together.
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 Alcohol and Amitriptyline together?
- Can I take Ashwagandha and Vitamin B12 together?
- Can I take Aspirin and Evolocumab together?
- Can I take Atorvastatin and Fibre supplements together?
- Can I take Beetroot and Candesartan together?
- Can I take Chaga and Cordyceps together?
- Can I take Codeine and Morphine together?
- Can I take Colecalciferol and Esomeprazole together?
- Can I take Empagliflozin and Fibre supplements together?
- Can I take Ezetimibe and Furosemide together?
- Can I take Fluanxol and Pregabalin together?
- Can I take Gabapentin and Zapain together?
- Can I take Guanfacine and Tizanidine together?
- Can I take Lansoprazole and Clopidogrel together?
- Can I take Omeprazole and Vitamin D together?
- Can I take Ramipril and Vitamin D together?
- Can I take Sertraline and Vitamin D3 together?
- Can I take Solifenacin and Vitamin B2 together?
- Can I take St John's wort and Vitamin D together?
- Can I take Vitamin B2 and Vitamin C together?