Pharmacology Notes: Beta Agonists, ICS, Theophylline, and Leukotriene Antagonists

Nonselective beta-adrenergic agonists stimulate both beta-1 and beta-2 receptors. This can affect heart rate and cause other systemic effects (as per transcript: “heart rate, causes vasoconstriction. Right? Nonselective stimulates both beta one and two. And then we have selective beta two.”).
Selective beta-2 agonists target the lungs, providing bronchodilation with fewer cardiac effects.
Salmeterol is a long-acting beta-2 agonist (LABA).
Antibiotic? Not relevant here — focus is on beta-adrenergic agonists for respiratory disease.
Salmeterol-containing regimens are maintenance (not for acute relief). The transcript emphasizes: “Not to be used for acute treatment. Maintenance.”
COPD and asthma management often includes a LABA with an inhaled corticosteroid (ICS) as maintenance therapy.
Example discussed: a combination involving salmeterol and an ICS (e.g., salmeterol + fluticasone) in one inhaler. The speaker notes two drugs in one therapy and mentions this as maintenance.
The speaker notes they do not have a combined drug to show you, but mentions the inhaled steroid separately (the ICS like Qvar).
Takeaway: maintenance therapy is typically once or twice daily, per physician order; not for acute attacks.

Inhaled steroids reduce airway inflammation when delivered directly to the lungs.
Beclomethasone (Qvar) is given as an inhaled corticosteroid in the discussion.
Fluticasone is another inhaled corticosteroid mentioned in the context of maintenance therapy.
Mechanism: decrease inflammation; goal is to reduce airway hyper-responsiveness and inflammatory mediators.
Indication: chronic management of COPD and asthma (maintenance). Not intended for acute relief.
Adverse effects are not elaborated in detail in the transcript for ICS specifically, but note typical concerns include oropharyngeal candidiasis and hoarseness in standard practice (not explicitly stated in the transcript).

The transcript identifies nausea, vomiting, and anorexia as adverse effects to note for theophylline (theoplin).
Theophylline can be problematic in certain patient populations (e.g., smokers) as it may be affected by smoking status.
Food and dietary interactions mentioned: theophylline serum levels can be decreased by certain foods and substances, including high-protein meals, charcoal, and boiled foods.
Practical teaching points:
- Monitor theophylline levels when patients have changes in smoking status, diet, or concurrent medications.
- Be aware of potential adverse effects beyond those listed (tachycardia, CNS effects, etc.), especially with narrow therapeutic index agents like theophylline.
The transcript notes these points as important teaching topics for anyone on theophylline.

Leukotriene receptor antagonists work by blocking leukotrienes, reducing inflammatory signals in the airway.
The transcript describes these agents as “antagonists … to prevent those leukotrienes from affecting the body” and to decrease inflammation.
Role in therapy: adjunctive anti-inflammatory option in asthma management; may be used in certain cases to reduce bronchoconstriction and inflammation.

When using an inhaled steroid together with a bronchodilator, the question arises: which to take first?
The transcript presents the question: “Which do I take first? Albuterol inhaler or inhaled steroid?”
Guideline-inspired answer (consistent with clinical practice reflected in teaching): use albuterol (short-acting beta-agonist, SABA) first to open the airways, then administer the inhaled corticosteroid for maintenance.
Rationale: bronchodilation improves delivery and penetration of the ICS into the airways; the SABA provides rapid relief of acute symptoms while the ICS provides ongoing anti-inflammatory control.
Additionally mentioned: there are combination inhalers that include a LABA (e.g., salmeterol) and an ICS (e.g., fluticasone); these should be used for maintenance, not acute relief.

Acute treatment: rescue inhalers (e.g., SABA like albuterol) for immediate bronchodilation during an attack.
Maintenance/Prevention: LABA (e.g., salmeterol) used for long-term control; ICS (e.g., fluticasone, beclomethasone Qvar) reduce airway inflammation.
Combination therapies: some inhalers combine LABA with ICS for convenience and adherence in maintenance therapy.
Theophylline is a less commonly used oral bronchodilator with narrow therapeutic index and notable drug/diet interactions; monitor levels and patient factors (e.g., smoking status).

COPD and asthma management rely on distinguishing maintenance therapy from acute relief therapy.
Proper inhaler technique and adherence are essential to ensure medications reach the lungs effectively.
When choosing therapies, consider potential drug interactions (e.g., theophylline with dietary factors), patient smoking status, and whether a combination inhaler is appropriate.
Educational points highlighted in the transcript emphasize patient teaching: labels like "maintenance" vs "acute" dosing, and the importance of timing when using multiple inhalers.

Salmeterol is a long-acting beta-2 agonist for maintenance; not for acute treatment. It can be used in combination with an inhaled corticosteroid.
Inhaled corticosteroids (e.g., Qvar/beclomethasone, fluticasone) reduce airway inflammation and are used for maintenance in COPD and asthma.
Theophylline (theoplin) has notable adverse effects (nausea, vomiting, anorexia) and significant interactions: smoking status can alter clearance; high-protein meals, charcoal, and boiled foods can decrease serum levels; monitor and educate patients accordingly.
Leukotriene receptor antagonists reduce leukotriene-mediated inflammation and are another anti-inflammatory option.
When using inhalers, if a bronchodilator and an ICS are prescribed together, take the bronchodilator first to optimize delivery of the ICS.
Always use maintenance therapies as prescribed and reserve rescue medications for immediate symptoms; be mindful of combination products and their intended use (maintenance only, not for acute relief).