Lidiax 5 mg, 20 mg FC tablets

LIDIAX is indicated for the treatment of erectile dysfunction. In order for LIDIAX to be effective, sexual stimulation is required.

Posology
In adult men: The recommended dose is 5 mg taken once a day taken at approximately the same time and without regard to food. The recommended maximum dose of LIDIAX is 20 mg taken prior to anticipated sexual activity and without regard to food taken up to 36 hours and as early as 16 minutes prior to sexual activity. Patients may initiate sexual activity at varying time points relative to dosing in order to determine their own optimal window of responsiveness. The maximum recommended dosing frequency for LIDIAX is once per day.
Special populations
Renal impairment
Dosage adjustments are not required in patients with mild or moderate renal impairment. Once-a-day dosing of LIDIAX is not recommended in patients with severe renal impairment.
Method of administration
For oral use.

• Hypersensitivity to the active substance, tadalafil, or to any of the excipients of LIDIAX listed in section 6.1.
• Administration of LIDIAX to patients who are using any form of organic nitrate.
• Patients with severe hepatic insufficiency (Child-Pugh Class C).
• Loss of vision in one or both eyes because of non-arteritic anterior ischaemic optic neuropathy (NAION) regardless whether this episode was in connection or not with previous PDE5 inhibitor exposure (see Section 4.4)
• Previous experience of unilateral or bilateral decrease or loss of hearing with or without associated vestibular symptoms.

Before treatment with LIDIAX A medical history and physical examination should be undertaken to diagnose erectile dysfunction and determine potential underlying causes, before pharmacological treatment is considered. Sexual activity carries a potential cardiac risk for patients with pre-existing cardiovascular disease. Prior to initiating any treatment for erectile dysfunction, medical practitioners should consider the cardiovascular status of their patients. Tadalafil has vasodilator properties, resulting in mild and transient decreases in blood pressure (see section 5.1) and as such potentiates the hypotensive effect of nitrates (see section 4.3). LIDIAX should not be used in men with cardiac disease for whom sexual activity is inadvisable. It is not known if tadalafil is effective in patients who have undergone pelvic surgery or radical non-nerve-sparing prostatectomy.
Cardiovascular
Tadalafil has systemic vasodilatory properties that may result in transient decreases in blood pressure. Prior to prescribing LIDIAX, medical practitioner should carefully consider whether their patients with underlying cardiovascular disease could be affected adversely by such vasodilatory effects.
- In patients receiving concomitant antihypertensive medicinal products, tadalafil may induce a blood pressure decrease. When initiating daily treatment with tadalafil, appropriate clinical considerations should be given to a possible dose adjustment of the antihypertensive therapy.
In patients who are taking alpha1 blockers, concomitant administration of LIDIAX may lead to symptomatic hypotension in some patients (see Section 4.5). The combination of tadalafil and doxazosin is not recommended.
In a clinical pharmacology study of 18 healthy volunteers who received a single dose of LIDIAX, no symptomatic hypotension was observed with simultaneous administration of tamsulosin, an u03b1 - [1A] blocker (see Section 4.5).
The use of LIDIAX is not recommended in the following patients:
u2022 with myocardial infarction within the last 90 days.
u2022 with unstable angina or angina occurring during sexual intercourse.
u2022 with New York Heart Association Class 2 or greater heart failure in the last 6 months.
u2022 with uncontrolled dysrhythmia, hypotension (< 90/50 mm Hg), or uncontrolled hypertension
u2022 with a stroke within the last 6 months.
Patients who experience symptoms upon initiation of sexual activity should be advised to refrain from further sexual activity and should report the episode to their medical practitioner.
Vision
Non-arteritic anterior ischemic optic neuropathy (NAION) is a cause of decreased vision including permanent loss of vision. Visual defects and cases of NAION have been reported in connection with the intake of LIDIAX and other PDE5 inhibitors. Analyses of observational data suggest an increased risk of acute NAION in men with erectile dysfunction following exposure to tadalafil or other PDE5 inhibitors. As this may be relevant for all patients exposed to tadalafil, the patient should be advised that in case of sudden visual defect, he should stop taking LIDIAX and consult a medical practitioner immediately (see section 4.3). Medical practitioner should also discuss with patients that individuals who have already experienced NAION are at increased risk of NAION.
Decreased or sudden hearing loss
Cases of sudden hearing loss have been reported after the use of tadalafil. Patients should be advised to stop taking LIDIAX and seek prompt medical attention in the event of sudden decrease or loss of hearing. These events may be accompanied by tinnitus and dizziness.
Renal and hepatic impairment
Due to increased tadalafil exposure (AUC), limited clinical experience and the lack of ability to influence clearance by dialysis, once-a-day dosing of tadalafil is not recommended in patients with severe renal impairment. Once-a-day administration has not been evaluated in patients with hepatic insufficiency.
Priapism and anatomical deformation of the penis
Patients who experience erections lasting 4 hours or more should be instructed to seek immediate medical assistance. If priapism is not treated immediately, penile tissue damage and permanent loss of potency may result. LIDIAX should be used with caution in patients with anatomical deformation of the penis (such as angulation, cavernosal fibrosis, or Peyronie's disease) or in patients who have conditions which may predispose them to priapism (such as sickle cell anaemia, multiple myeloma or leukaemia).
Use with CYP3A4 inhibitors
Caution should be exercised when prescribing LIDIAX to patients using potent CYP3A4 inhibitors (ritonavir, saquinavir, ketoconazole, itraconazole, and erythromycin), as increased tadalafil exposure (AUC) has been observed if the medicinal products are combined (see section 4.5).
LIDIAX and other treatments for erectile dysfunction
The safety and efficacy of combinations of LIDIAX and other PDE5 inhibitors or other treatments for erectile dysfunction have not been studied. The patients should be informed not to take LIDIAX in such combinations.
Lactose
Patients with the rare hereditary conditions of galactose intolerance, total lactase deficiency, glucose-galactose malabsorption should not take LIDIAX.

Effect of other medicines on tadalafil
Cytochrome P450 inhibitors
LIDIAX is principally metabolised by CYP3A4. A selective inhibitor of CYP3A4, ketoconazole (200 mg daily), increased tadalafil (10 mg) exposure (AUC) 2 - fold and Cmax by 15 %, relative to the AUC and Cmax values for tadalafil alone. Ketoconazole (400 mg daily), increased tadalafil 20 mg single - dose exposure (AUC) 4 - fold and Cmax by 22 %.
Transporters
The role of transporters (for example, p-glycoprotein) in the disposition of tadalafil is not known. Therefore, there is the potential of medicine interactions mediated by inhibition of transporters.
Cytochrome P450 inducers
A selective CYP3A4 inducer, rifampicin (rifampicin, 600 mg daily), reduced tadalafil single-dose exposure (AUC) by 88 % and Cmax by 46 %, relative to the AUC and Cmax values for tadalafil alone. This reduced exposure can be anticipated to decrease the efficacy of tadalafil; the magnitude of decreased efficacy is unknown. It can be expected that concomitant administration of other CYP3A4 inducers, such as phenobarbitone, phenytoin and carbamazepine may also decrease plasma concentrations of tadalafil.
Ritonavir (200 mg twice daily) an inhibitor of CYP3A4, 2C9, 2C19 and 2D6, increased tadalafil single-dose exposure (AUC) by 124 % with no change in Cmax. Although specific interactions have not been studied, other HIV protease inhibitors, such as saquinavir, and other CYP3A4 inhibitors such as erythromycin and itraconazole, would likely increase tadalafil exposure.
Antacids
Simultaneous administration of an antacid (magnesium hydroxide/aluminium hydroxide) and tadalafil reduced the apparent rate of absorption of tadalafil without altering exposure (AUC) to tadalafil.
H2-antagonists
An increase in gastric pH resulting from administration of nizatidine, an H2 antagonist, had no significant effect on tadalafil pharmacokinetics.
Effects of tadalafil on other medicines
Nitrates
In clinical studies, tadalafil was shown to augment the hypotensive effects of nitrates. Therefore, administration of tadalafil to patients who are using any form of organic nitrate is contraindicated (see Section 4.3).
Anti-hypertensives
Tadalafil has systemic vasodilatory properties and may augment the blood pressure lowering effects of antihypertensive medicines. Additionally, in patients taking multiple antihypertensive medicines whose hypertension was not well controlled, greater reductions in blood pressure were observed. These reductions were not associated with hypotensive symptoms in the vast majority of patients. Appropriate clinical advice should be given to patients when they are treated with antihypertensive medications and tadalafil. Tadalafil had no clinically significant effect on blood pressure changes due to tamsulosin, an u03b1 -adrenergic receptor blocking agent. The co-administration of doxazosin (4 and 8 mg daily) and tadalafil (5 mg daily dose and 20 mg as a single dose) increases the blood pressure-lowering effect of this alpha-blocker in a significant manner. This effect lasts at least twelve hours and may be symptomatic, including syncope. Some patients experienced dizziness. Therefore, this combination is not recommended (see section 4.4).
CYP1A2 substrates
Tadalafil had no clinically significant effect on the pharmacokinetics or pharmacodynamics of theophylline, a CYP1A2 substrate.
Ethinylestradiol and terbutaline
Tadalafil has been demonstrated to produce an increase in the oral bioavailability of ethinylestradiol; a similar increase may be expected with oral administration of terbutaline, although the clinical consequence of this is uncertain.
Alcohol
Tadalafil did not affect alcohol concentrations and alcohol did not affect tadalafil concentrations. At high doses of alcohol (0,7 g/kg), the addition of tadalafil did not induce statistically significant mean blood pressure decreases. In some subjects, postural dizziness and orthostatic hypotension were observed. When tadalafil was administered with lower doses of alcohol (0,6 g/kg), hypotension was not observed and dizziness occurred with similar frequency to alcohol alone.

LIDIAX is not indicated for use by women. Safety and efficacy of LIDIAX in pregnancy and lactation have not been established.
Pregnancy
LIDIAX should not be used during pregnancy.
Breastfeeding
LIDIAX should not be used during breast feeding.
Fertility
Although animal studies indicate impairment of fertility, subsequent clinical studies suggest this is unlikely in humans. A decrease in sperm concentration has however, been seen in some men (see Section 5.3).

LIDIAX has a negligible influence on the ability to drive or use machines. However, there have been reports of dizziness, therefore patients should be aware of how they react to LIDIAX before driving or using machines.

Summary of the safety profile
The most commonly reported adverse reactions in patients taking tadalafil for the treatment of erectile dysfunction were headache, dyspepsia, back pain and myalgia, in which the incidences increase with increasing dose of tadalafil. The adverse reactions reported were transient, and generally mild or moderate. The majority of headaches reported with tadalafil once-a-day dosing are experienced within the first 10 to 30 days of starting treatment.
Tabulated list of adverse reactions

Single doses of up to 500 mg have been given to healthy subjects and multiple daily doses up to 100 mg have been given to patients. Adverse events were similar to those seen at lower doses. In cases of overdose, standard supportive measures should be adopted as required. Haemodialysis contributes negligibly to tadalafil elimination.