Efficacy and Safety of Acetylcysteine for the Treatment of Acute Uncomplicated Rhinosinusitis

Efficacy and Safety of Acetylcysteine for the Treatment of Acute Uncomplicated Rhinosinusitis: a Prospective, Randomized, Double-blind, Placebo-controlled Trial

ClinicalTrials.gov Identifier: NCT04123405

Novartis Reference Number: 2018-08-EFT-1

Last Update: Oct 30, 2020

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All compounds are either investigational or being studied for (a) new use(s). Efficacy and safety have not been established. There is no guarantee that they will become commercially available for the use(s) under investigation. 

Study Description

The trial will be conducted as a prospective, randomized, multinational, multicenter, double-blind study in 4 parallel groups of patients. Approximately 900 patients with acute, uncomplicated rhinosinusitis will be randomized.

Phase 3
Overall status 
Enrollment count 
900 participants
Start date 
Oct 22, 2020
Completion date 
Mar 31, 2021
14 Years - 75 Years (Child, Adult, Older Adult)


600 mg tablet
Placebo to acetylcysteine

Eligibility Criteria

Inclusion Criteria:

Male or female subjects aged between 14 and 75 years inclusive on the date of consent

Diagnosis of acute, uncomplicated rhinosinusitis defined at screening visit 1 and at Visit 2 as:

major symptom score (MSS) assessed by the patient ≥8 and ≤12 points for the following: rhinorrhea/ anterior discharge, postnasal drip, nasal congestion, headache, and facial pain/pressure, whereupon the nasal congestion is mandatory and no more than 3 of the 5 symptoms are rated as severe
individual score for facial pain/pressure ≥1 (mild) and ≤2 (moderate)
presence of symptoms ≤3 days prior to screening visit
For adults (≥18 years): Informed consent to participate in the trial provided in written form; For adolescents (≥14 - <18 years): own subject informed consent/ assent to participate in the trial and the informed consent from all parent(s)/ legal guardian(s) provided in written form.

Exclusion Criteria:

History of hypersensitivity or intolerance to the active substance or any of the excipients of the trial medication
Patient with history of hereditary fructose intolerance, galactose intolerance, lactase deficiency or glucose-galactose malabsorption
Chronic rhinosinusitis (symptoms lasting longer than 3 months)
Subjects who have undergone sinus or nasal surgery for chronic rhinosinusitis in the 6 months prior to screening visit
Sinus lavage within 7 days prior to screening visit
Odontogenic rhinosinusitis
Allergic (perennial or seasonal) rhinitis
Bronchial asthma or chronic obstructive pulmonary disease
Nasal polyposis or clinically relevant nasal septum deviation
Concomitant otitis
Intranasal or systemic use of corticosteroids within 30 days prior to screening visit
Intranasal or systemic use of antibiotics within 30 days prior to screening visit
Use of nasal decongestants within 2 days prior to screening visit

Concomitant treatment of common cold-like symptoms within 7 days prior to screening visit with any of the following:

Non-steroidal anti-inflammatory drugs
Concomitant use of intranasal saline irrigation
Use of immunosuppressive agents within 30 days prior to screening visit
Immunocompromised state
Suspicion for acute bacterial rhinosinusitis (defined as presence of purulence for 3 to 4 days with fever ≥ 38.3°C)
Pregnant or breast-feeding female patient
Female patient of childbearing potential (not surgically sterilized/hysterectomized or postmenopausal for at least 1 year) who is not currently using (documented at screening visit) and not willing to use medically reliable methods of contraception for the entire trial duration such as oral, injectable or implantable contraceptives, intrauterine contraceptive devices (IUD), sexual abstinence or vasectomized partner
Any other condition of the patient (e.g. serious or unstable medical or psychological condition, acute psychosis) that in the opinion of the investigator may compromise evaluation of the trial treatment or may jeopardize patient's safety, compliance or adherence to protocol requirements
Participation in ANY research study involving another investigational medicinal product (IMP) within 30 days prior to screening visit, or simultaneous participation in another clinical study or previous participation in present study
Suspected alcohol/ drug dependence or abuse (including heavy smoking: ≥ 20 cigarettes daily)
Use of snuff tobacco
Legal incapacity and/or other circumstances rendering the patient unable to understand the nature, scope and possible consequences of the trial

Subjects who are known or suspected:

not to comply with the trial directives
not to be reliable or trustworthy
to be a dependent person, e.g. a relative, family member, or member/employee of the investigator's or sponsor's staff
subject is in custody or submitted to an institution due to a judicial order.

Study Locations

Sandoz Investigative Site
Gabrovo, 5300


Novartis Pharmaceuticals

Have a question?

Call 1-888-669-6682 or email [email protected]