I'm sorry to hear that your cold symptoms are persisting despite medication. A runny nose with a lot of phlegm lasting more than a week may suggest that the infection is still active or there could be another underlying issue such as sinusitis or allergies.

Here are some steps you can take next:

• Consult an Ear, Nose, and Throat (ENT) specialist for a thorough evaluation to rule out sinus infection or other causes.
• Continue to stay well-hydrated and rest as much as possible.
• Use a saline nasal spray or warm steam inhalation to help clear nasal passages and loosen phlegm.
• Avoid irritants like smoke or strong perfumes that can worsen symptoms.
• If you have been taking over-the-counter or prescribed medication without improvement, do not self-medicate further without medical advice.

Since your symptoms have lasted over a week despite treatment, it is important to see a doctor who can examine you and possibly recommend further tests or a different treatment plan.

If you experience worsening symptoms such as high fever, severe headache, facial pain, or difficulty breathing, seek urgent medical care immediately.

Please consult an ENT specialist for personalized care and appropriate treatment.To narrow down potential causes, we will need some more information.I understand that you have a cold with a runny nose and a lot of phlegm even after taking medicine for 6 days. To provide you with the best advice, could you please tell me your age and gender?