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You can request Viagra tablets online or get a prescription filled in most UK pharmacies. Branded versions of sildenafil, such as Viagra, are only available on the NHS in special circumstances. It is more effective than lower dosages of Viagra, but is also more likely to cause side effects.
The reduced exposure of tadalafil with the coadministration of rifampin or other CYP3A4 inducers can be anticipated to decrease the efficacy of Cialis for once daily use