Hypersensitivity to the active substance.
In clinical studies, tadalafil was shown to augment the hypotensive effects of nitrates. This is thought to result from the combined effects of nitrates and tadalafil on the nitric oxide/cGMP pathway. Therefore, administration of HappiLong to patients who are using any form of organic nitrate is contraindicated.
HappiLong, must not be used in men with cardiac disease for whom sexual activity is inadvisable.
Physicians should consider the potential cardiac risk of sexual activity in patients with pre-existing cardiovascular disease.
The following groups of patients with cardiovascular disease were not included in clinical trials and the use of tadalafil is therefore contraindicated: Patients with myocardial infarction within the last 90 days.
Patients with unstable angina or angina occurring during sexual intercourse.
Patients with New York Heart Association class 2 or greater heart failure in the last 6 months.
Patients with uncontrolled arrhythmias, hypotension (<90/50 mmHg), or uncontrolled hypertension.
Patients with a stroke within the last 6 months.
HappiLong is contraindicated in patients who have loss of vision in one eye because of non-arteritic anterior ischaemic optic neuropathy (NAION), regardless of whether this episode was in connection or not with previous PDE5 inhibitor exposure.