Patrex
·
- Prescription status not stated
- Urinary and reproductive system, hormones
- Active substance
- Sildenafil
- Made by
- Pfizer Limited
- Source
- Official label
Quoted from the official source. Not yet reviewed by Mediclarum — the leaflet in your pack is authoritative.
What it is for
- Treatment of men with erectile dysfunction, which is the inability to achieve or maintain a penile erection sufficient for satisfactory sexual performance. In order for Patrex to be effective, sexual stimulation is required. Patrex is not indicated for use by women.
From the official label · 2026-09-30 · European Medicines Agency
How it works
This product’s leaflet is published as a scanned document. This section quotes the US prescribing label for the same active substance (sildenafil citrate). It describes the substance, not this Bulgarian product — its uses and doses can differ.
The physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation.
NO then activates the enzyme guanylate cyclase, which results in increased levels of cyclic guanosine monophosphate (cGMP), producing smooth muscle relaxation in the corpus cavernosum and allowing inflow of blood.
It is eliminated predominantly by hepatic metabolism (mainly CYP3A4) and is converted to an active metabolite with properties similar to the parent, sildenafil.
After either oral or intravenous administration, sildenafil is excreted as metabolites predominantly in the feces (approximately 80% of administered oral dose) and to a lesser extent in the urine (approximately 13% of the administered oral dose).
When sildenafil is taken with a high fat meal, the rate of absorption is reduced, with a mean delay in T max of 60 minutes and a mean reduction in C max of 29%.
Quoted from the prescribing label, sections “Mechanism of Action” and “Pharmacokinetics”. DailyMed · 2026-07-29
Same active substance, strength and form in other countries
Matched on active substance, strength and kind of form only. This is not a statement that the products are equivalent or interchangeable: other ingredients, release and approved uses can differ — ask a pharmacist before swapping.
Medicine passport: one printable page to show a pharmacist abroad
United StatesNo exact match for this strength and form
BulgariaNo exact match for this strength and form
SpainNo exact match for this strength and form
CanadaNo exact match for this strength and form
NetherlandsNo exact match for this strength and form
SwitzerlandNo exact match for this strength and form
Details
| Made by | Pfizer Limited |
|---|---|
| Active substance | Sildenafil |
| Used in | Urinary and reproductive system, hormones |
| Classification | G04BE03 · Urinary and reproductive system, hormones |
| Authorised on | 1998-09-15 |
| Last updated by the regulator | 2005-08-18 |
| EMA product number | EMEA/H/C/000204 |
Source: European Medicines Agency — medicine data · 2026-09-30 · not reviewed by a clinician
Source: European Medicines Agency (EMA). Product information as published by EMA. Reuse terms: EMA legal notice (reproduction authorised).
Same active substance
These contain the same substance. That does not mean one can replace another — ask a pharmacist.