Tell your doctor or pharmacist if you are currently taking, have recently taken, or plan to take other medicines while using doxazosin. This is because some medicines may interact with doxazosin.
Medicines that may interact with doxazosin include:
- medicines for erectile dysfunction (like tadalafil, sildenafil, or vardenafil)
- other medicines for high blood pressure
- ketoconazole (normally used for fungal infections)
- medicines that can lower your blood pressure (like antidepressants, muscle relaxants, and medicines for Parkinson’s disease such as levodopa)
- medicines that are used to treat HIV (e.g. indinavir, ritonavir and others)
To make sure that doxazosin is right for you, let your doctor know if you:
- have ever had a previous allergic reaction to doxazosin, or similar medicines like terazosin, or prazosin
- are breastfeeding or pregnant
- have orthostatic hypotension (a kind of low blood pressure that can cause you to feel lightheaded or dizzy when standing up)
- have low blood pressure and an enlarged prostate gland
- are due to have cataract surgery
- or if you have any other medical conditions
Doxazosin and Viagra
Talk to your doctor or pharmacist before using Viagra (sildenafil) together with doxazosin. This is because if you combine these medications, it may lower your blood pressure, and increase the risk of fainting, dizziness, headaches, lightheadedness, and nasal congestion. If you get these symptoms and they do not go away or become troublesome, let your doctor know.
Doxazosin and ibuprofen
Non-steroidal anti-inflammatory medicines like ibuprofen may increase your blood pressure when taking doxazosin tablets. It is best to keep them to a minimum.
What painkillers can I take with doxazosin?
You can take painkillers like codeine or paracetamol safely with doxazosin tablets.
Doxazosin and alcohol
If you drink alcohol while taking doxazosin, this can increase the blood pressure-lowering effect of the medicine. This can cause you to feel lightheaded or dizzy. It is advised not to drink alcohol during the first few days of taking the tablets, or if your dose has been increased. Wait until you see how the tablets affect you before you do, if you are planning to do so.
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