Always inform your doctor about all medications you’re taking before starting Viagra 100mg. Certain drugs can interact negatively, potentially causing dangerous side effects or reducing Viagra’s effectiveness. This includes prescription and over-the-counter medications, supplements, and herbal remedies.
Nitrates and Viagra
Combining Viagra with nitrates (used to treat chest pain) is extremely dangerous and can lead to a drastic drop in blood pressure, potentially causing a heart attack or stroke. Avoid using Viagra if you’re taking any form of nitrates.
Alpha-blockers and Viagra
Alpha-blockers, frequently prescribed for high blood pressure or prostate problems, can cause a similar, though less severe, blood pressure drop when combined with Viagra. Your doctor might adjust your dosage or recommend an alternative.
Other Medications
Several other medications can interact with Viagra. These include, but are not limited to, certain antifungals, HIV medications, and some antibiotics. Open communication with your doctor about your complete medication list ensures your safety.
Specific Interactions: Table Summary
| Nitrates | Severe blood pressure drop | Avoid concurrent use. |
| Alpha-blockers | Moderate blood pressure drop | Doctor consultation advised. |
| CYP3A4 inhibitors (e. g., some antifungals) | Increased Viagra levels | Dosage adjustment may be necessary. |
| CYP3A4 inducers (e. g., some anticonvulsants) | Decreased Viagra levels | Dosage adjustment may be necessary. |
Grapefruit Juice
Grapefruit juice inhibits the enzymes that metabolize Viagra, leading to higher blood levels of the drug and increasing the risk of side effects. Limit or avoid grapefruit juice consumption while taking Viagra.
