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(si-meth-i-kone) ,


(trade name),

Extra Strength Gas-X

(trade name),


(trade name),

Gas Relief

(trade name),


(trade name),


(trade name),


(trade name),

Maximum Strength Mylanta Gas

(trade name),

Mylanta Gas

(trade name),


(trade name),


(trade name),


(trade name),


(trade name)


Therapeutic: antiflatulent
Pregnancy Category: UK


Relief of painful symptoms of excess gas in the GI tract that may occur postoperatively or as a consequence of:
  • Air swallowing,
  • Dyspepsia,
  • Peptic ulcer,
  • Diverticulitis.


Causes the coalescence of gas bubbles.
Does not prevent the formation of gas.

Therapeutic effects

Passage of gas through the GI tract by belching or passing flatus.


Absorption: No systemic absorption occurs.
Distribution: Not systemically distributed.
Metabolism and Excretion: Excreted unchanged in the feces.
Half-life: Unknown.

Time/action profile (antiflatulent effect)

POimmediateunknown3 hr


Contraindicated in: Not recommended for infant colic.
Use Cautiously in: Abdominal pain of unknown cause, especially when accompanied by fever; Obstetric / Lactation: Has been used safely.

Adverse Reactions/Side Effects

None significant.


Drug-Drug interaction

None significant.


Oral (Adults) 40–125 mg qid, after meals and at bedtime (up to 500 mg/day).
Oral (Children 2–12 yr) 40 mg 4 times daily.
Oral (Children <2 yr) 20 mg 4 times daily (up to 240 mg/day).

Availability (generic available)

Chewable tablets: 40 mgOTC, 80 mgOTC, 125 mgOTC, 150 mgOTC
Tablets: 60 mgOTC, 80 mgOTC, 95 mgOTC
Capsules: 125 mgOTC, 166 mgOTC, 180 mgOTC
Drops: 40 mg/0.6 mLOTC, 40 mg/mLOTC, 95 mg/1.425 mLOTC
In combination with: antacidsOTC. See combination drugs.

Nursing implications

Nursing assessment

  • Assess patient for abdominal pain, distention, and bowel sounds prior to and periodically throughout course of therapy. Frequency of belching and passage of flatus should also be assessed.

Potential Nursing Diagnoses

Acute pain (Indications)


  • Oral: Administer after meals and at bedtime for best results. Shake liquid preparations well prior to administration. Chewable tablets should be chewed thoroughly before swallowing for faster and more complete results.
    • Drops can be mixed with 30 mL of cool water, infant formula, or other liquid as directed. Shake well before using.

Patient/Family Teaching

  • Explain to patient the importance of diet and exercise in the prevention of gas. Also explain that this medication does not prevent the formation of gas.
  • Advise patient to notify health care professional if symptoms are persistent.

Evaluation/Desired Outcomes

  • Decrease in abdominal distention and discomfort.
Drug Guide, © 2015 Farlex and Partners


To release and vent gases. New building materials often give off gases and odors and the air should be well circulated to remove them.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The Johnstown degasser consists of a 9 1/2-foot-diameter vacuum chamber made
Additional features include a GPCmax integrated pump, autosampler and degasser module designed for GPC/SEC applications, and OmniSEC CFR 21 Part 11 compliant software for complete system control, data acquisition, analysis and reporting.
It features an integrated Tetra Detector Array comprised of a low angle light scattering (LALS) detector, four capillary viscometer detectors, RI and UV/ VIS; a GPCmax pump, autosampler and degasser module specifically designed for GPC/SEC applications; and OmniSEC software for multiple detection analysis and complete system control.
The systems feature the Triple Detector Array (TDA) and the GPCmax, an integrated pump, auto-sampler and degasser, specifically designed for GPC/SEC applications.
Dissolved oxygen is removed in-line up to 0.6 ppm to provide a powerful and efficient degasser. Based on the principle of continuous vacuum filtration across a gas-permeable membrane, the system contains four solvent channels, is CPU-controlled and offers built-in self-diagnostics.
Optimal speeds and flow rates are essential for effective operation of the degasser, In addition, when nitrogen is used as the degasser, it produces wet dross while argon produces dry dross.
The triple detector system features an integrated triple detector array (TDA) comprised of a low angle light scattering (LALS) detector, four capillary viscometer detector, a GPC-max pump, autosampler and degasser module, said to be specifically designed for GPC/SEC applications, and OmniSEC software for multiple detection analysis and complete system control.
GPCmax integrates a pump, autosampler and degasser module for GPC/SEC applications.
The rotary degasser provides the kinetic mixing between the flux, carrier gas and the metal to create full-vessel reaction.