These two healthcare stocks are well-known for their top-tier dividend programs.Dividend stocks tend to struggle in high-interest-rate environments. The core reason is investors have an abundance of low-risk, high-yield income options when interest rates spike.Conversely, fund managers have historically pivoted to top-tier dividend stocks when interest rates fall. The logic behind this trend is that dividend stocks ought to deliver superior returns to risk-free assets like U.S. T-bills in low-rate environme ...