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can you buy viagra without a prescription Si durante la actividad del sexo, usted nota mareo, náusea, o tiene dolor, entumecimiento, o cosquilleo en su pecho, brazos, cuello, o mandíbula, pare de hacer la actividad y llame de inmediato a su médico. Le puede estar ocurriendo un efecto secundario de gravedad que causa vardenafil.Vardenafil puede disminuir el flujo de sangre al nervio óptico del ojo, causando pérdida de la visión de forma súbita. Esto ha sucedido en un número peque?o de personas que tomaron Viagra u otras drogas similares a vardenafil. La mayoría de estas personas también tenían ciertos problemas preexistentes del ojo o factores de riesgo para trastornos de los vasos sanguíneos (como enfermedad del corazón, diabetes, presión arterial alta, colesterol elevado, enfermedad de las arterias coronarias, fumar, o tener más de 50 a?os). No se entiende con claridad si vardenafil puede causar pérdida de la visión.There is limited clinical data on the safety of single-dose administration of CIALIS in patients with severe hepatic insufficiency (Child-Pugh Class C). Once-a-day administration has not been evaluated in patients with hepatic insufficiency. If CIALIS is prescribed, a careful individual benefit/risk evaluation should be undertaken by the prescribing physician.Mutagenesis — Tadalafil was not mutagenic in the in vitro bacterial Ames assays or the forward mutation test in mouse lymphoma cells. Tadalafil was not clastogenic in the in vitro chromosomal aberration test in human lymphocytes or the in vivo rat micronucleus assays.

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Sanofi and Eli Lilly announced plans Wednesday to seek regulatory approval from the U.S. Food and Drug Administration to sell Cialis without a prescription. As they strive to prove that it can be sold safely without a doctor’s guidance, here are some things you might not know about the ED drug.

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Cialis for once daily use has not been extensively evaluated in patients with mild or moderate hepatic impairment. Therefore, caution is advised if Cialis for once daily use is prescribed to these patients. Because of insufficient information in patients with severe hepatic impairment, use of Cialis in this group is not recommended [see Use in Specific Populations (8.6)].