Clinical Trials Experience
Because clinical studies are conducted under widely varying conditions, adverse reactions rates observed in the prescription flomax side effects clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug and may not reflect the rates observed in practice.
The incidence of treatment-emergent adverse events has been ascertained from six short-term U.S. and European placebo-controlled clinical trials in which daily doses of 0.1 to 0.8 mg FLOMAX capsules were used. These studies evaluated safety in 1783 patients treated with FLOMAX capsules and 798 patients administered placebo. Table 1 summarizes the treatment-emergent adverse events that occurred in ≥2% of patients receiving either FLOMAX capsules 0.4 mg or 0.8 mg and at an incidence numerically higher than that in the placebo group during two 13-week U.S. trials (US92-03A and US93-01) conducted in 1487 men.
Table 1 : Treatment-Emergent1 Adverse Events Occurring in ≥2% of FLOMAX Capsules or Placebo Patients in Two U.S. Short-Term Placebo-Controlled Clinical Studies
n=493 0.4 mg
n=502 0.8 mg
n=492 BODY AS WHOLE Headache 97 (19.3%) 104 (21.1%) 99 (20.1%) Infection2 45 (9.0%) 53 (10.8%) 37 (7.5%) Asthenia 39 (7.8%) 42 (8.5%) 27 (5.5%) Back pain 35 (7.0%) 41 (8.3%) 27 (5.5%) Chest pain 20 (4.0%) 20 (4.1%) 18 (3.7%) NERVOUS SYSTEM Dizziness 75 (14.9%) 84 (17.1%) 50 (10.1%) Somnolence 15 (3.0%) 21 (4.3%) 8 (1.6%) Insomnia 12 (2.4%) 7 (1.4%) 3 (0.6%) Libido decreased 5 (1.0%) 10 (2.0%) 6 (1.2%) RESPIRATORY SYSTEM Rhinitis3 66 (13.1%) 88 (17.9%) 41 (8.3%) Pharyngitis 29 (5.8%) 25 (5.1%) 23 (4.7%) Cough increased 17 (3.4%) 22 (4.5%) 12 (2.4%) Sinusitis 11 (2.2%) 18 (3.7%) 8 (1.6%) DIGESTIVE SYSTEM Diarrhea 31 (6.2%) 21 (4.3%) 22 (4.5%) Nausea 13 (2.6%) 19 (3.9%) 16 (3.2%) Tooth disorder 6 (1.2%) 10 (2.0%) 7 (1.4%) UROGENITAL SYSTEM Abnormal ejaculation 42 (8.4%) 89 (18.1%) 1 (0.2%) SPECIAL SENSES Blurred vision 1 (0.2%) 10 (2.0%) 2 (0.4%) 1 A treatment-emergent adverse event was defined as any event satisfying one of the following criteria:
- The adverse event occurred for the first time after initial dosing with double-blind study medication.
- The adverse event was present prior to or at the time of initial dosing with double-blind study medication and subsequently increased in severity during double-blind treatment; or
- The adverse event was present prior to or at the time of initial dosing with double-blind study medication, disappeared completely, and then reappeared during double-blind treatment.
3 Coding preferred terms also include nasal congestion, stuffy nose, runny nose, sinus congestion, and hay fever.
Signs And Symptoms Of Orthostasis
In the two U.S. studies, symptomatic postural hypotension was reported by 0.2% of patients (1 of 502) in the 0.4 mg group, 0.4% of patients (2 of 492) in the 0.8 mg group, and by no patients in the placebo group. Syncope was reported by 0.2% of patients (1 of 502) in the 0.4 mg group, 0.4% of patients (2 of 492) in the 0.8 mg group, and 0.6% of patients (3 of 493) in the placebo group. Dizziness was reported by 15% of patients (75 of 502) in the 0.4 mg group, 17% of patients (84 of 492) in the 0.8 mg group, and 10% of patients (50 of 493) in the placebo group. Vertigo was reported by 0.6% of patients (3 of 502) in the 0.4 mg group, 1% of patients (5 of 492) in the 0.8 mg group, and by 0.6% of patients (3 of 493) in the placebo group.
Multiple testing for orthostatic hypotension was conducted in a number of studies. Such a test was considered positive if it met one or more of the following criteria: (1) a decrease in systolic blood pressure of ≥20 mmHg upon standing from the supine position during the orthostatic tests; (2) a decrease in diastolic blood pressure ≥10 mmHg upon standing, with the standing diastolic blood pressure < 65 mmHg during the orthostatic test; (3) an increase in pulse rate of ≥20 bpm upon standing with a standing pulse rate ≥100 bpm during the orthostatic test; and (4) the presence of clinical symptoms (faintness, lightheadedness/lightheaded, dizziness, spinning sensation, vertigo, or postural hypotension) upon standing during the orthostatic test.
Following the first dose of double-blind medication in Study 1, a positive orthostatic test result at 4 hours postdose was observed in 7% of patients (37 of 498) who received FLOMAX capsules 0.4 mg once daily and in 3% of the patients (8 of 253) who received placebo. At 8 hours post-dose, a positive orthostatic test result was observed for 6% of the patients (31 of 498) who received FLOMAX capsules 0.4 mg once daily and 4% (9 of 250) who received placebo (Note: patients in the 0.8 mg group received 0.4 mg once daily for the first week of Study 1).
In Studies 1 and 2, at least one positive orthostatic test result was observed during the course of these studies for 81 of the 502 patients (16%) in the FLOMAX capsules 0.4 mg once-daily group, 92 of the 491 patients (19%) in the FLOMAX capsules 0.8 mg once-daily group, and 54 of the 493 patients (11%) in the placebo group.
Because orthostasis was detected more frequently in FLOMAX capsule-treated patients than in placebo recipients, there is a potential risk of syncope [see WARNINGS AND PRECAUTIONS].
Abnormal ejaculation includes ejaculation failure, ejaculation disorder, retrograde ejaculation, and ejaculation decrease. As shown in Table 1, abnormal ejaculation was associated with FLOMAX capsules administration and was dose-related in the U.S. studies. Withdrawal from these clinical studies of FLOMAX capsules because of abnormal ejaculation was also dose-dependent, with 8 of 492 patients (1.6%) in the 0.8 mg group and no patients in the 0.4 mg or placebo groups discontinuing treatment due to abnormal ejaculation.
No laboratory test interactions with FLOMAX capsules are known. Treatment with FLOMAX capsules for up to 12 months had no significant effect on prostate-specific antigen (PSA).
The following adverse reactions have been identified during post-approval use of FLOMAX capsules. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Decisions to include these reactions in labeling are typically based on one or more of the following factors: (1) seriousness of the reaction, (2) frequency of reporting, or (3) strength of causal connection to FLOMAX capsules.
Allergic-type reactions such as skin rash, urticaria, pruritus, angioedema, and respiratory symptoms have been reported with positive rechallenge in some cases. Priapism has been reported rarely. Infrequent reports of dyspnea, palpitations, hypotension, atrial fibrillation, arrhythmia, tachycardia, skin desquamation including reports of Stevens-Johnson syndrome, erythema multiforme, dermatitis exfoliative, constipation, vomiting, dry mouth, visual impairment, and epistaxis have been received during the postmarketing period.
During cataract and glaucoma surgery, a variant of small pupil syndrome known as Intraoperative Floppy Iris Syndrome (IFIS) has been reported in association with alpha1 blocker therapy [see WARNINGS AND PRECAUTIONS].
Read the entire FDA prescribing information for Flomax (Tamsulosin Hydrochloride)
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