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Combining medications without the knowledge of your doctor can be dangerous. It could cause severe side effects or give rise to certain health conditions that may become difficult to treat. Similarly use of sildenafil should also be combined with other medications only on the advice of your doctor. It is also essential that you talk to your doctor about all the over the counter drugs and herbal medicines that you may be using.
Similarly, you should check with your pharmacist before taking any new drug while on sildenafil treatment, so that the combination of drugs remains safe for use. Sildenafil should never be combined with any form of nitrate formulations. This can cause a severe drop in blood pressure, which may lead to fainting, dizziness, or even a heart attack. The following are nitrate medications.
- Glyceryl Trinitrate, Isosorbide Mononitrate and Isosorbide Dinitrate - These are used to treat heart failure and angina. If you suffer from chest pain after taking this drug, never use nitrates to treat it.
- Nicorandil
- Amyl nitrate, also known as ‘poppers’
Viagra Sildenafil should be used with caution in individuals who are taking alpha-blockers. This combination may also increase the risk of a severe drop in blood pressure, which causes fainting and dizziness. Alpha-blockers include:
- Alfuzosin
- Doxazosin
- Indoramin
- Prazosin
- Tamsulosin
- Terazosin
 
Your doctor may prescribe a dose of 25mg of sildenafil, if you are taking an alpha-blocker medicine. If you start feeling dizzy or light headed, you should lie down on the floor and stay in that position until the symptoms pass. In case you feel that the symptoms are severe, you should contact your doctor immediately. In addition, sildenafil should not be combined with other erectile dysfunction medications.
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