Reference:
1. http://www.mims.com/Thailand/drug/info/Patar-cap/?tabrecent=2
2. Guaifenesin . In: DRUGDEX System [database on the internet]. Ann Arbor (MI): Truven Health Analytics; 2014. Available from: www.micromedexsolutions.com.
3. Dextromethorphan. In: DRUGDEX System [database on the internet]. Ann Arbor (MI): Truven Health Analytics; 2014. Available from: www.micromedexsolutions.com.
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