Singulair (Montelukast) 4 mg, 5 mg, 10 mg

What is Singulair?

Singulair is the brand name for montelukast, a prescription medication used to help control asthma and relieve symptoms of seasonal or year-round allergies. It belongs to a class of drugs called leukotriene receptor antagonists, which block specific chemicals involved in inflammation and allergic responses.

Unlike inhalers or fast-acting allergy tablets, Singulair is taken once a day and works preventively — not as a rescue treatment. It’s FDA-approved for adults and children as young as 6 months (for allergies) and age 1 and older (for asthma), making it one of the few oral options suitable for pediatric asthma maintenance.

If you’ve been prescribed Singulair, it’s likely part of a broader asthma or allergy management plan — especially if you experience symptoms at night, during pollen season, or after exercise. While it doesn’t replace inhaled steroids, many people find that it adds a helpful layer of protection when triggers can’t be avoided.

How It Works

Singulair blocks leukotrienes — inflammatory molecules released when the body encounters allergens or irritants. These leukotrienes contribute to airway tightening, mucus production, nasal congestion, and general inflammation in people with asthma or allergic rhinitis.

By targeting this pathway, Singulair helps reduce swelling in the airways, prevent wheezing, and ease allergy symptoms like sneezing, runny nose, and itchy eyes. It works best when taken daily, even if you’re not experiencing symptoms that day.

It’s not a steroid, and it doesn’t work instantly — that’s why it’s not used for emergency asthma attacks. However, it’s one of the few non-inhaled options that works systemically, making it appealing for children who struggle with inhalers or for adults managing multiple allergies year-round.

Some families and long-term users choose to buy Singulair online once a stable dose is reached, especially through licensed refill services offering generic options or cheap 90-day supplies with prescription support.

Dosage & How to Take

Singulair comes in 4 mg, 5 mg, and 10 mg strengths — available as chewable tablets, granules for mixing, or regular tablets depending on the patient's age and needs. It is typically taken once daily in the evening.

• Adults and teens (15+): 10 mg tablet once daily
• Children 6–14 years: 5 mg chewable tablet once daily
• Children 2–5 years: 4 mg chewable tablet or oral granules once daily
• Children 6 months–2 years: 4 mg oral granules (for allergic rhinitis only)

It can be taken with or without food. Oral granules can be mixed with soft foods (e.g., applesauce, ice cream) but must be used within 15 minutes once opened.

Try to take Singulair at the same time each day — typically in the evening, especially for asthma prevention. If you’re using it for seasonal allergies, some providers recommend starting a few weeks before your worst season begins.

Generic montelukast is widely available. Many people choose to buy Singulair online using licensed pharmacies, which may offer cheaper prices, especially with generic bulk fills or telehealth subscriptions.

Side Effects

Singulair is generally well tolerated, but as with any medication, side effects are possible. Most are mild and short-lived. Common side effects include:

• Headache
• Stomach pain or indigestion
• Fatigue
• Fever (especially in children)
• Diarrhea

Less commonly, Singulair has been associated with neuropsychiatric side effects such as:

• Agitation or irritability
• Abnormal dreams or insomnia
• Anxiety
• Depression or mood changes
• Very rarely, suicidal thoughts or behavior

These effects are rare, but the FDA added a boxed warning to montelukast labels in 2020 to raise awareness. If you or your child begins to show mood changes, new sleep issues, or emotional shifts after starting Singulair, notify your doctor promptly. In most cases, switching medications resolves the issue.

Many people use Singulair long-term without problems. However, regular check-ins — especially after dose changes or in children/adolescents — help ensure ongoing safety and benefit.

Warnings & Interactions

Singulair should not be used to treat sudden asthma attacks. Always keep a rescue inhaler on hand and follow your asthma action plan.

Let your provider know if you have:

• History of depression, anxiety, or suicidal thoughts
• Severe liver disease (rare, but may affect metabolism)
• Seizure disorder (precautionary monitoring may be advised)
• Allergic reactions to similar medications

There are few known drug interactions with montelukast, but it’s always a good idea to share your full medication list. It does not interact with antihistamines, inhaled steroids, or allergy shots, so it’s often used as part of combination therapy.

Pregnant or breastfeeding? Singulair is sometimes used during pregnancy, but always consult your OB/GYN or allergist first. It is not a controlled substance and has not shown fetal harm in animal studies, but human data is limited.

For many families managing seasonal asthma or allergic rhinitis, it’s convenient to buy Singulair online — particularly the generic — through licensed mail-order pharmacies or subscription services. Just ensure your source is reputable and matches your current prescription strength and form.