Loading
If this is the first time anyone has visited this substance, we may be fetching live data from TGA Product Information, PBS, and state framework sources — that can take up to a minute. Cached substances load in a second or two.
Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. It is unclear if it is effective for treating sexual dysfunction in females. It can be taken orally (swallowed by mouth), intravenously (injection into a vein), or through the sublingual route (dissolved under the tongue). Onset when taken orally is typically within twenty minutes and lasts for about two hours.
Read the full article on WikipediaPulmonary arterial hypertension (PAH) Clinical criteria: Treatment Phase: Initial 1 - combination therapy (dual or triple therapy, excluding selexipag) in an untreated patient Patient must not have received prior PBS-subsidised treatment with a pulmonary arterial hypertension (PAH) agent, AND Patient must currently have WHO Functional Class III PAH or WHO Functional Class IV PAH, AND The treatment must form part of dual combination therapy consisting of: (i) one endothelin receptor antagonist, (ii) one phosphodiesterase-5 inhibitor; OR The treatment must form part of dual combination therapy consisting of: (i) one prostanoid, (ii) one phosphodiesterase-5 inhibitor; OR The treatment must form part of triple combination therapy consisting of: (i) one endothelin receptor antagonist, (ii) one phosphodiesterase-5 inhibitor, (iii) one prostanoid; triple combination therapy is treating a patient with class IV PAH. Treatment criteria: Must be treated by a physician with expertise in the management of PAH, with this authority application to be completed by the physician with expertise in PAH. Applications for authorisation of initial treatment must be made via the Online PBS Authorities System (real time assessment) or in writing via HPOS form upload or mail. If the application is submitted through HPOS form upload or mail, it must include: (a) details of the proposed prescription; and (b) a completed authority application form relevant to the indication and treatment phase (the latest version is located on the website specified in the Administrative Advice). (1) Confirm that the patient has a diagnosis of pulmonary arterial hypertension (PAH) in line with the following definition: (a) mean pulmonary artery pressure (mPAP) at least 25 mmHg at rest and pulmonary artery wedge pressure (PAWP) no greater than 15 mmHg; or (b) where right heart catheterisation (RHC) cannot be performed on clinical grounds, right ventricular systolic pressure assessed by echocardiography (ECHO) is greater than 40 mmHg, with normal left ventricular function. (2) Confirm that in forming the diagnosis of PAH, the following tests have been conducted: - RHC composite assessment; and - ECHO composite assessment; and - 6 Minute Walk Test (6MWT) Where it is not possible to perform all 3 tests on clinical grounds, the expected test combination, in descending order, is: - RHC plus ECHO composite assessments; - RHC composite assessment plus 6MWT; - RHC composite assessment only. In circumstances where RHC cannot be performed on clinical grounds, the expected test combination, in descending order, is: - ECHO composite assessment plus 6MWT; - ECHO composite assessment only. (3) Document the findings of these tests in the patient's medical records, including, where relevant only, the reason/s: (i) for why fewer than 3 tests are able to be performed on clinical grounds; (ii) why RHC cannot be performed on clinical grounds - confirm this by obtaining a second opinion from another PAH physician or cardiologist with expertise in the management of PAH; document that this has occurred in the patient's medical records. (4) Confirm that this authority application is not seeking subsidy for a patient with pulmonary hypertension secondary to interstitial lung disease associated with connective tissue disease, where the total lung capacity is less than 70% of predicted.
Erectile dysfunction Clinical criteria: The condition must be vasculogenic; OR The condition must be psychogenic; OR The condition must be neurogenic, AND Patient must have a specific accepted war-caused or service-related disability. Population criteria: Patient must be male. Authorisation will not be given for any additional prescriptions within 6 months or for any increased quantities or repeats.
“Sildenafil protects cyclic guanosine monophosphate (cGMP) from degradation by cGMP-specific phosphodiesterase type 5 (PDE5) in the corpus cavernosum. Nitric oxide (NO) in the corpus cavernosum of the penis binds to guanylate cyclase receptors, which results in increased levels of cGMP, leading to smooth muscle relaxation (vasodilation) of the intimal cushions of the helicine arteries. This smooth muscle relaxation leads to vasodilation and increased inflow of blood into the spongy tissue of the penis, causing an erection. Robert F. Furchgott, Ferid Murad, and Louis Ignarro won the Nobel Prize in Physiology or Medicine in 1998 for their independent study of the metabolic pathway of nitric oxide in smooth muscle vasodilation.”
“3–4 hours”
Working under the parallel aged-care framework? Aged-care equivalent →