Is there any side effects of Nalgesic Forte?

Hi there,
I'm assuming the product you're referring to is actually called "Norgesic Forte", also known as "Norflex" www.myshopping.com.au/PT--219_Pharmaceuticals?Find=Norflex
Norflex is used along with rest, physical therapy and other therapies to relax muscles and relieve pain. The side effects can include stomach upset, headache, blurred vision, drowsiness, dizziness, lightheadedness, dry mouth, constipation, difficulty urinating or flushing may occur. If any of these effects continue or become bothersome, inform your doctor. Notify your doctor immediately if you develop: a rapid heart rate, fainting, fever, breathing difficulties, skin rash, mental confusion, depression. To avoid dizziness and lightheadedness when rising from a seated or lying position, get up slowly. Also limit your intake of alcoholic beverages which will aggravate these effects. Use caution performing tasks requiring alertness if this medication causes you to feel drowsy. If you notice other effects not listed above, contact your doctor or pharmacist.
There are multiple precautions to take note of if you're considering this medication as well: PRECAUTIONS: Tell your doctor if you have: kidney disease, liver disease, bladder problems, heart disease, prostate trouble, ulcers, glaucoma, myasthenia gravis, allergies. This medication should be used during pregnancy only if clearly needed. Discuss the risks and benefits with your doctor. It is not known if this medication appears in breast milk. Consult your doctor before breast-feeding. Limit the use of alcohol while taking this medication since excessive drowsiness or depression can occur.

I would highly suggest consulting your doctor before beginning any new medication.
Good luck!