combining Viagra (sildenafil) with Cardura (doxazosin) and other alpha-blockers

There's a new precaution about combining Viagra (sildenafil) with Cardura (doxazosin) and other alpha-blockers.

These drugs are commonly used together. Many men taking alpha-blockers for BPH also take Viagra.

In fact, doxazosin is sometimes combined with Viagra to increase Viagra's effect.

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