IRCT20250816066868N1 IRCT 2025-12-06 Mashhad University of Medical Sciences Investigating the effect of Melissa officinalis capsules on functional dyspepsia Investigating the effect of Melissa officinalis capsules on functional dyspepsia: a clinical trial study 2025-09-23 anticipated 94 Recruiting https://irct.ir/trial/85741 interventional Randomization: Randomized, Blinding: Triple blinded, Placebo: Used, Assignment: Parallel, Purpose: Treatment, Randomization description: To ensure equal and completely random distribution of participants in the groups, the randomization process will be carried out entirely through the online system https://www.sealedenvelope.com. To randomly assign individuals to two groups A and B in a 1:1 ratio, a block randomization method with sizes of 4 and 6 will be used, so that a total of 94 participants will be randomly distributed between the two groups through 13 blocks of 4 and 7 blocks of 6, Blinding description: Patients were randomly assigned to receive either the drug or placebo, which were packaged identically and provided to the researcher after coding (in blocks of four and six). Statistical analysis will be conducted by an individual who is unaware of the intervention groups. Allocation concealment has also been maintained. 3 Functional dyspepsia. Intervention 1: Intervention group:: A capsule containing 500 mg of lemon balm powder, taken twice a day after meals, for a duration of 4 weeks. Intervention 2: Control group: Capsule containing 500 mg of Avicel, twice a day after meals, for a duration of 4 weeks. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is No additional information is available.