Piritan Adverse Reactions

Based on the analysis of pooled placebo-controlled trials, comprising a total of 1,923 patients on Pramipexole and 1,354 patients on placebo, adverse drug reactions were frequently reported for both groups. 63% of patients on Pramipexole and 52% of patients on placebo reported at least one adverse drug reaction.
The majority of adverse drug reactions usually start early in therapy and most tend to disappear even as therapy is continued.
Within the system organ classes, adverse reactions are listed under headings of frequency (number of patients expected to experience the reaction), using the following categories: very common (≥ 1/10); common (≥ 1/100 to < 1/10); uncommon (≥ 1/1,000 to < 1/100); rare (≥ 1/10,000 to < 1/1,000); very rare (< 1/10,000); not known (cannot be estimated from the available data).
Parkinson's disease, most common adverse reactions: The most commonly (≥ 5%) reported adverse drug reactions in patients with Parkinson's disease more frequent with Pramipexole treatment than with placebo were nausea, dyskinesia, hypotension, dizziness, somnolence, insomnia, constipation, hallucination, headache and fatigue. The incidence of somnolence is increased at doses higher than 1.5 mg Pramipexole salt per day (see Dosage & Administration). A more frequent adverse drug reaction in combination with levodopa was dyskinesia.
Hypotension may occur at the beginning of treatment, especially if Pramipexole is titrated too fast. (See Table 3.)

Click on icon to see table/diagram/image

Restless Legs Syndrome, most common adverse reactions: The most commonly (≥ 5%) reported adverse drug reactions in patients with Restless Legs Syndrome treated with Pramipexole were nausea, headache, dizziness and fatigue. Nausea and fatigue were more often reported in female patients treated with Pramipexole (20.8% and 10.5%, respectively) compared to males (6.7% and 7.3%, respectively). (See Table 4.)

Click on icon to see table/diagram/image

Description of selected adverse reactions: Somnolence: Pramipexole is commonly associated with somnolence and has been associated uncommonly with excessive daytime somnolence and sudden sleep onset episodes (see Precautions).
Libido disorders: Pramipexole may uncommonly be associated with libido disorders (increased or decreased).
Impulse control disorders: Pathological gambling, increased libido, hypersexuality, compulsive spending or buying, binge eating and compulsive eating can occur in patients treated with dopamine agonists including Pramipexole (see Precautions).
In a cross-sectional, retrospective screening and case-control study including 3,090 Parkinson's disease patients, 13.6% of all patients receiving dopaminergic or non-dopaminergic treatment had symptoms of an impulse control disorder during the past six months. Manifestations observed include pathological gambling, compulsive shopping, binge eating, and compulsive sexual behaviour (hypersexuality). Possible independent risk factors for impulse control disorders included dopaminergic treatments and higher doses of dopaminergic treatment, younger age (≤ 65 years), not being married and self-reported family history of gambling behaviours.
Dopamine agonist withdrawal syndrome: Non-motor adverse effects may occur when tapering or discontinuing dopamine agonists including Pramipexole. Symptoms include apathy, anxiety, depression, fatigue, sweating and pain (see Precautions).
Cardiac failure: In clinical studies and post-marketing experience cardiac failure has been reported in patients with Pramipexole. In a pharmacoepidemiological study Pramipexole use was associated with an increased risk of cardiac failure compared with non-use of Pramipexole (observed risk ratio 1.86; 95% CI, 1.21-2.85).